21456420

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{277}}^1\times {\mathrm{1291}}^1$

素因数の和:1580

約数の個数: 48

約数和(自身を含む): 60341568

約数和(自身を除く): 38885148

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 277, 554, 831, 1108, 1291, 1385, 1662, 2582, 2770, 3324, 3873, 4155, 5164, 5540, 6455, 7746, 8310, 12910, 15492, 16620, 19365, 25820, 38730, 77460, 357607, 715214, 1072821, 1430428, 1788035, 2145642, 3576070, 4291284, 5364105, 7152140, 10728210, 21456420]

約数ペア:

[(1, 21456420), (2, 10728210), (3, 7152140), (4, 5364105), (5, 4291284), (6, 3576070), (10, 2145642), (12, 1788035), (15, 1430428), (20, 1072821), (30, 715214), (60, 357607), (277, 77460), (554, 38730), (831, 25820), (1108, 19365), (1291, 16620), (1385, 15492), (1662, 12910), (2582, 8310), (2770, 7746), (3324, 6455), (3873, 5540), (4155, 5164)]