640609840

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{615971}}^1$

素因数の和:615997

約数の個数: 40

約数和(自身を含む): 1603991088

約数和(自身を除く): 963381248

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 615971, 1231942, 2463884, 3079855, 4927768, 6159710, 8007623, 9855536, 12319420, 16015246, 24638840, 32030492, 40038115, 49277680, 64060984, 80076230, 128121968, 160152460, 320304920, 640609840]

約数ペア:

[(1, 640609840), (2, 320304920), (4, 160152460), (5, 128121968), (8, 80076230), (10, 64060984), (13, 49277680), (16, 40038115), (20, 32030492), (26, 24638840), (40, 16015246), (52, 12319420), (65, 9855536), (80, 8007623), (104, 6159710), (130, 4927768), (208, 3079855), (260, 2463884), (520, 1231942), (1040, 615971)]