256213420

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{210011}}^1$

素因数の和:210081

約数の個数: 24

約数和(自身を含む): 546871248

約数和(自身を除く): 290657828

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 244, 305, 610, 1220, 210011, 420022, 840044, 1050055, 2100110, 4200220, 12810671, 25621342, 51242684, 64053355, 128106710, 256213420]

約数ペア:

[(1, 256213420), (2, 128106710), (4, 64053355), (5, 51242684), (10, 25621342), (20, 12810671), (61, 4200220), (122, 2100110), (244, 1050055), (305, 840044), (610, 420022), (1220, 210011)]