20419840

素因数分解:

$2^8\times 5^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{53}}^1$

素因数の和:124

約数の個数: 144

約数和(自身を含む): 58278528

約数和(自身を除く): 37858688

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 43, 53, 56, 64, 70, 80, 86, 106, 112, 128, 140, 160, 172, 212, 215, 224, 256, 265, 280, 301, 320, 344, 371, 424, 430, 448, 530, 560, 602, 640, 688, 742, 848, 860, 896, 1060, 1120, 1204, 1280, 1376, 1484, 1505, 1696, 1720, 1792, 1855, 2120, 2240, 2279, 2408, 2752, 2968, 3010, 3392, 3440, 3710, 4240, 4480, 4558, 4816, 5504, 5936, 6020, 6784, 6880, 7420, 8480, 8960, 9116, 9632, 11008, 11395, 11872, 12040, 13568, 13760, 14840, 15953, 16960, 18232, 19264, 22790, 23744, 24080, 27520, 29680, 31906, 33920, 36464, 38528, 45580, 47488, 48160, 55040, 59360, 63812, 67840, 72928, 77056, 79765, 91160, 94976, 96320, 118720, 127624, 145856, 159530, 182320, 192640, 237440, 255248, 291712, 319060, 364640, 385280, 474880, 510496, 583424, 638120, 729280, 1020992, 1276240, 1458560, 2041984, 2552480, 2917120, 4083968, 5104960, 10209920, 20419840]

約数ペア:

[(1, 20419840), (2, 10209920), (4, 5104960), (5, 4083968), (7, 2917120), (8, 2552480), (10, 2041984), (14, 1458560), (16, 1276240), (20, 1020992), (28, 729280), (32, 638120), (35, 583424), (40, 510496), (43, 474880), (53, 385280), (56, 364640), (64, 319060), (70, 291712), (80, 255248), (86, 237440), (106, 192640), (112, 182320), (128, 159530), (140, 145856), (160, 127624), (172, 118720), (212, 96320), (215, 94976), (224, 91160), (256, 79765), (265, 77056), (280, 72928), (301, 67840), (320, 63812), (344, 59360), (371, 55040), (424, 48160), (430, 47488), (448, 45580), (530, 38528), (560, 36464), (602, 33920), (640, 31906), (688, 29680), (742, 27520), (848, 24080), (860, 23744), (896, 22790), (1060, 19264), (1120, 18232), (1204, 16960), (1280, 15953), (1376, 14840), (1484, 13760), (1505, 13568), (1696, 12040), (1720, 11872), (1792, 11395), (1855, 11008), (2120, 9632), (2240, 9116), (2279, 8960), (2408, 8480), (2752, 7420), (2968, 6880), (3010, 6784), (3392, 6020), (3440, 5936), (3710, 5504), (4240, 4816), (4480, 4558)]