81085420

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{311867}}^1$

素因数の和:311889

約数の個数: 24

約数和(自身を含む): 183378384

約数和(自身を除く): 102292964

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 311867, 623734, 1247468, 1559335, 3118670, 4054271, 6237340, 8108542, 16217084, 20271355, 40542710, 81085420]

約数ペア:

[(1, 81085420), (2, 40542710), (4, 20271355), (5, 16217084), (10, 8108542), (13, 6237340), (20, 4054271), (26, 3118670), (52, 1559335), (65, 1247468), (130, 623734), (260, 311867)]