20985283840

素因数分解:

$2^8\times 5^1\times {\mathrm{31}}^1\times {\mathrm{528863}}^1$

素因数の和:528915

約数の個数: 72

約数和(自身を含む): 51887904768

約数和(自身を除く): 30902620928

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 256, 310, 320, 496, 620, 640, 992, 1240, 1280, 1984, 2480, 3968, 4960, 7936, 9920, 19840, 39680, 528863, 1057726, 2115452, 2644315, 4230904, 5288630, 8461808, 10577260, 16394753, 16923616, 21154520, 32789506, 33847232, 42309040, 65579012, 67694464, 81973765, 84618080, 131158024, 135388928, 163947530, 169236160, 262316048, 327895060, 338472320, 524632096, 655790120, 676944640, 1049264192, 1311580240, 2098528384, 2623160480, 4197056768, 5246320960, 10492641920, 20985283840]

約数ペア:

[(1, 20985283840), (2, 10492641920), (4, 5246320960), (5, 4197056768), (8, 2623160480), (10, 2098528384), (16, 1311580240), (20, 1049264192), (31, 676944640), (32, 655790120), (40, 524632096), (62, 338472320), (64, 327895060), (80, 262316048), (124, 169236160), (128, 163947530), (155, 135388928), (160, 131158024), (248, 84618080), (256, 81973765), (310, 67694464), (320, 65579012), (496, 42309040), (620, 33847232), (640, 32789506), (992, 21154520), (1240, 16923616), (1280, 16394753), (1984, 10577260), (2480, 8461808), (3968, 5288630), (4960, 4230904), (7936, 2644315), (9920, 2115452), (19840, 1057726), (39680, 528863)]