20386220

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{131}}^1\times {\mathrm{251}}^1$

素因数の和:422

約数の個数: 48

約数和(自身を含む): 44706816

約数和(自身を除く): 24320596

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 131, 155, 251, 262, 310, 502, 524, 620, 655, 1004, 1255, 1310, 2510, 2620, 4061, 5020, 7781, 8122, 15562, 16244, 20305, 31124, 32881, 38905, 40610, 65762, 77810, 81220, 131524, 155620, 164405, 328810, 657620, 1019311, 2038622, 4077244, 5096555, 10193110, 20386220]

約数ペア:

[(1, 20386220), (2, 10193110), (4, 5096555), (5, 4077244), (10, 2038622), (20, 1019311), (31, 657620), (62, 328810), (124, 164405), (131, 155620), (155, 131524), (251, 81220), (262, 77810), (310, 65762), (502, 40610), (524, 38905), (620, 32881), (655, 31124), (1004, 20305), (1255, 16244), (1310, 15562), (2510, 8122), (2620, 7781), (4061, 5020)]