21720

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{181}}^1$

素因数の和:195

約数の個数: 32

約数和(自身を含む): 65520

約数和(自身を除く): 43800

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120, 181, 362, 543, 724, 905, 1086, 1448, 1810, 2172, 2715, 3620, 4344, 5430, 7240, 10860, 21720]

約数ペア:

[(1, 21720), (2, 10860), (3, 7240), (4, 5430), (5, 4344), (6, 3620), (8, 2715), (10, 2172), (12, 1810), (15, 1448), (20, 1086), (24, 905), (30, 724), (40, 543), (60, 362), (120, 181)]