21641560

素因数分解:

$2^3\times 5^1\times {\mathrm{659}}^1\times {\mathrm{821}}^1$

素因数の和:1491

約数の個数: 32

約数和(自身を含む): 48826800

約数和(自身を除く): 27185240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 659, 821, 1318, 1642, 2636, 3284, 3295, 4105, 5272, 6568, 6590, 8210, 13180, 16420, 26360, 32840, 541039, 1082078, 2164156, 2705195, 4328312, 5410390, 10820780, 21641560]

約数ペア:

[(1, 21641560), (2, 10820780), (4, 5410390), (5, 4328312), (8, 2705195), (10, 2164156), (20, 1082078), (40, 541039), (659, 32840), (821, 26360), (1318, 16420), (1642, 13180), (2636, 8210), (3284, 6590), (3295, 6568), (4105, 5272)]