399888920

素因数分解:

$2^3\times 5^1\times {\mathrm{113}}^1\times {\mathrm{88471}}^1$

素因数の和:88595

約数の個数: 32

約数和(自身を含む): 907722720

約数和(自身を除く): 507833800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 113, 226, 452, 565, 904, 1130, 2260, 4520, 88471, 176942, 353884, 442355, 707768, 884710, 1769420, 3538840, 9997223, 19994446, 39988892, 49986115, 79977784, 99972230, 199944460, 399888920]

約数ペア:

[(1, 399888920), (2, 199944460), (4, 99972230), (5, 79977784), (8, 49986115), (10, 39988892), (20, 19994446), (40, 9997223), (113, 3538840), (226, 1769420), (452, 884710), (565, 707768), (904, 442355), (1130, 353884), (2260, 176942), (4520, 88471)]