81078920

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{155921}}^1$

素因数の和:155945

約数の個数: 32

約数和(自身を含む): 196461720

約数和(自身を除く): 115382800

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 155921, 311842, 623684, 779605, 1247368, 1559210, 2026973, 3118420, 4053946, 6236840, 8107892, 10134865, 16215784, 20269730, 40539460, 81078920]

約数ペア:

[(1, 81078920), (2, 40539460), (4, 20269730), (5, 16215784), (8, 10134865), (10, 8107892), (13, 6236840), (20, 4053946), (26, 3118420), (40, 2026973), (52, 1559210), (65, 1247368), (104, 779605), (130, 623684), (260, 311842), (520, 155921)]