20505680

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19717}}^1$

素因数の和:19743

約数の個数: 40

約数和(自身を含む): 51345672

約数和(自身を除く): 30839992

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19717, 39434, 78868, 98585, 157736, 197170, 256321, 315472, 394340, 512642, 788680, 1025284, 1281605, 1577360, 2050568, 2563210, 4101136, 5126420, 10252840, 20505680]

約数ペア:

[(1, 20505680), (2, 10252840), (4, 5126420), (5, 4101136), (8, 2563210), (10, 2050568), (13, 1577360), (16, 1281605), (20, 1025284), (26, 788680), (40, 512642), (52, 394340), (65, 315472), (80, 256321), (104, 197170), (130, 157736), (208, 98585), (260, 78868), (520, 39434), (1040, 19717)]