20521280

素因数分解:

$2^6\times 5^1\times {\mathrm{13}}^1\times {\mathrm{4933}}^1$

素因数の和:4963

約数の個数: 56

約数和(自身を含む): 52635912

約数和(自身を除く): 32114632

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 130, 160, 208, 260, 320, 416, 520, 832, 1040, 2080, 4160, 4933, 9866, 19732, 24665, 39464, 49330, 64129, 78928, 98660, 128258, 157856, 197320, 256516, 315712, 320645, 394640, 513032, 641290, 789280, 1026064, 1282580, 1578560, 2052128, 2565160, 4104256, 5130320, 10260640, 20521280]

約数ペア:

[(1, 20521280), (2, 10260640), (4, 5130320), (5, 4104256), (8, 2565160), (10, 2052128), (13, 1578560), (16, 1282580), (20, 1026064), (26, 789280), (32, 641290), (40, 513032), (52, 394640), (64, 320645), (65, 315712), (80, 256516), (104, 197320), (130, 157856), (160, 128258), (208, 98660), (260, 78928), (320, 64129), (416, 49330), (520, 39464), (832, 24665), (1040, 19732), (2080, 9866), (4160, 4933)]