20397440

素因数分解:

$2^7\times 5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{157}}^1$

素因数の和:212

約数の個数: 128

約数和(自身を含む): 58017600

約数和(自身を除く): 37620160

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 29, 32, 35, 40, 56, 58, 64, 70, 80, 112, 116, 128, 140, 145, 157, 160, 203, 224, 232, 280, 290, 314, 320, 406, 448, 464, 560, 580, 628, 640, 785, 812, 896, 928, 1015, 1099, 1120, 1160, 1256, 1570, 1624, 1856, 2030, 2198, 2240, 2320, 2512, 3140, 3248, 3712, 4060, 4396, 4480, 4553, 4640, 5024, 5495, 6280, 6496, 8120, 8792, 9106, 9280, 10048, 10990, 12560, 12992, 16240, 17584, 18212, 18560, 20096, 21980, 22765, 25120, 25984, 31871, 32480, 35168, 36424, 43960, 45530, 50240, 63742, 64960, 70336, 72848, 87920, 91060, 100480, 127484, 129920, 140672, 145696, 159355, 175840, 182120, 254968, 291392, 318710, 351680, 364240, 509936, 582784, 637420, 703360, 728480, 1019872, 1274840, 1456960, 2039744, 2549680, 2913920, 4079488, 5099360, 10198720, 20397440]

約数ペア:

[(1, 20397440), (2, 10198720), (4, 5099360), (5, 4079488), (7, 2913920), (8, 2549680), (10, 2039744), (14, 1456960), (16, 1274840), (20, 1019872), (28, 728480), (29, 703360), (32, 637420), (35, 582784), (40, 509936), (56, 364240), (58, 351680), (64, 318710), (70, 291392), (80, 254968), (112, 182120), (116, 175840), (128, 159355), (140, 145696), (145, 140672), (157, 129920), (160, 127484), (203, 100480), (224, 91060), (232, 87920), (280, 72848), (290, 70336), (314, 64960), (320, 63742), (406, 50240), (448, 45530), (464, 43960), (560, 36424), (580, 35168), (628, 32480), (640, 31871), (785, 25984), (812, 25120), (896, 22765), (928, 21980), (1015, 20096), (1099, 18560), (1120, 18212), (1160, 17584), (1256, 16240), (1570, 12992), (1624, 12560), (1856, 10990), (2030, 10048), (2198, 9280), (2240, 9106), (2320, 8792), (2512, 8120), (3140, 6496), (3248, 6280), (3712, 5495), (4060, 5024), (4396, 4640), (4480, 4553)]