20990320

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20183}}^1$

素因数の和:20209

約数の個数: 40

約数和(自身を含む): 52559136

約数和(自身を除く): 31568816

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20183, 40366, 80732, 100915, 161464, 201830, 262379, 322928, 403660, 524758, 807320, 1049516, 1311895, 1614640, 2099032, 2623790, 4198064, 5247580, 10495160, 20990320]

約数ペア:

[(1, 20990320), (2, 10495160), (4, 5247580), (5, 4198064), (8, 2623790), (10, 2099032), (13, 1614640), (16, 1311895), (20, 1049516), (26, 807320), (40, 524758), (52, 403660), (65, 322928), (80, 262379), (104, 201830), (130, 161464), (208, 100915), (260, 80732), (520, 40366), (1040, 20183)]