20528560

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19739}}^1$

素因数の和:19765

約数の個数: 40

約数和(自身を含む): 51402960

約数和(自身を除く): 30874400

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19739, 39478, 78956, 98695, 157912, 197390, 256607, 315824, 394780, 513214, 789560, 1026428, 1283035, 1579120, 2052856, 2566070, 4105712, 5132140, 10264280, 20528560]

約数ペア:

[(1, 20528560), (2, 10264280), (4, 5132140), (5, 4105712), (8, 2566070), (10, 2052856), (13, 1579120), (16, 1283035), (20, 1026428), (26, 789560), (40, 513214), (52, 394780), (65, 315824), (80, 256607), (104, 197390), (130, 157912), (208, 98695), (260, 78956), (520, 39478), (1040, 19739)]