81437440

素因数分解:

$2^8\times 5^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{149}}^1$

素因数の和:238

約数の個数: 144

約数和(自身を含む): 228110400

約数和(自身を除く): 146672960

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 56, 61, 64, 70, 80, 112, 122, 128, 140, 149, 160, 224, 244, 256, 280, 298, 305, 320, 427, 448, 488, 560, 596, 610, 640, 745, 854, 896, 976, 1043, 1120, 1192, 1220, 1280, 1490, 1708, 1792, 1952, 2086, 2135, 2240, 2384, 2440, 2980, 3416, 3904, 4172, 4270, 4480, 4768, 4880, 5215, 5960, 6832, 7808, 8344, 8540, 8960, 9089, 9536, 9760, 10430, 11920, 13664, 15616, 16688, 17080, 18178, 19072, 19520, 20860, 23840, 27328, 33376, 34160, 36356, 38144, 39040, 41720, 45445, 47680, 54656, 63623, 66752, 68320, 72712, 78080, 83440, 90890, 95360, 109312, 127246, 133504, 136640, 145424, 166880, 181780, 190720, 254492, 267008, 273280, 290848, 318115, 333760, 363560, 508984, 546560, 581696, 636230, 667520, 727120, 1017968, 1163392, 1272460, 1335040, 1454240, 2035936, 2326784, 2544920, 2908480, 4071872, 5089840, 5816960, 8143744, 10179680, 11633920, 16287488, 20359360, 40718720, 81437440]

約数ペア:

[(1, 81437440), (2, 40718720), (4, 20359360), (5, 16287488), (7, 11633920), (8, 10179680), (10, 8143744), (14, 5816960), (16, 5089840), (20, 4071872), (28, 2908480), (32, 2544920), (35, 2326784), (40, 2035936), (56, 1454240), (61, 1335040), (64, 1272460), (70, 1163392), (80, 1017968), (112, 727120), (122, 667520), (128, 636230), (140, 581696), (149, 546560), (160, 508984), (224, 363560), (244, 333760), (256, 318115), (280, 290848), (298, 273280), (305, 267008), (320, 254492), (427, 190720), (448, 181780), (488, 166880), (560, 145424), (596, 136640), (610, 133504), (640, 127246), (745, 109312), (854, 95360), (896, 90890), (976, 83440), (1043, 78080), (1120, 72712), (1192, 68320), (1220, 66752), (1280, 63623), (1490, 54656), (1708, 47680), (1792, 45445), (1952, 41720), (2086, 39040), (2135, 38144), (2240, 36356), (2384, 34160), (2440, 33376), (2980, 27328), (3416, 23840), (3904, 20860), (4172, 19520), (4270, 19072), (4480, 18178), (4768, 17080), (4880, 16688), (5215, 15616), (5960, 13664), (6832, 11920), (7808, 10430), (8344, 9760), (8540, 9536), (8960, 9089)]