400000025

素因数分解:

$5^2\times {\mathrm{109}}^1\times {\mathrm{229}}^1\times {\mathrm{641}}^1$

素因数の和:989

約数の個数: 24

約数和(自身を含む): 503520600

約数和(自身を除く): 103520575

約数列:

[1, 5, 25, 109, 229, 545, 641, 1145, 2725, 3205, 5725, 16025, 24961, 69869, 124805, 146789, 349345, 624025, 733945, 1746725, 3669725, 16000001, 80000005, 400000025]

約数ペア:

[(1, 400000025), (5, 80000005), (25, 16000001), (109, 3669725), (229, 1746725), (545, 733945), (641, 624025), (1145, 349345), (2725, 146789), (3205, 124805), (5725, 69869), (16025, 24961)]