20965640

素因数分解:

$2^3\times 5^1\times {\mathrm{67}}^1\times {\mathrm{7823}}^1$

素因数の和:7901

約数の個数: 32

約数和(自身を含む): 47882880

約数和(自身を除く): 26917240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 67, 134, 268, 335, 536, 670, 1340, 2680, 7823, 15646, 31292, 39115, 62584, 78230, 156460, 312920, 524141, 1048282, 2096564, 2620705, 4193128, 5241410, 10482820, 20965640]

約数ペア:

[(1, 20965640), (2, 10482820), (4, 5241410), (5, 4193128), (8, 2620705), (10, 2096564), (20, 1048282), (40, 524141), (67, 312920), (134, 156460), (268, 78230), (335, 62584), (536, 39115), (670, 31292), (1340, 15646), (2680, 7823)]