21720920

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{41771}}^1$

素因数の和:41795

約数の個数: 32

約数和(自身を含む): 52632720

約数和(自身を除く): 30911800

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 41771, 83542, 167084, 208855, 334168, 417710, 543023, 835420, 1086046, 1670840, 2172092, 2715115, 4344184, 5430230, 10860460, 21720920]

約数ペア:

[(1, 21720920), (2, 10860460), (4, 5430230), (5, 4344184), (8, 2715115), (10, 2172092), (13, 1670840), (20, 1086046), (26, 835420), (40, 543023), (52, 417710), (65, 334168), (104, 208855), (130, 167084), (260, 83542), (520, 41771)]