20581225

素因数分解:

$5^2\times 7^2\times {\mathrm{53}}^1\times {\mathrm{317}}^1$

素因数の和:394

約数の個数: 36

約数和(自身を含む): 30342924

約数和(自身を除く): 9761699

約数列:

[1, 5, 7, 25, 35, 49, 53, 175, 245, 265, 317, 371, 1225, 1325, 1585, 1855, 2219, 2597, 7925, 9275, 11095, 12985, 15533, 16801, 55475, 64925, 77665, 84005, 117607, 388325, 420025, 588035, 823249, 2940175, 4116245, 20581225]

約数ペア:

[(1, 20581225), (5, 4116245), (7, 2940175), (25, 823249), (35, 588035), (49, 420025), (53, 388325), (175, 117607), (245, 84005), (265, 77665), (317, 64925), (371, 55475), (1225, 16801), (1325, 15533), (1585, 12985), (1855, 11095), (2219, 9275), (2597, 7925)]