21349840

素因数分解:

$2^4\times 5^1\times {\mathrm{103}}^1\times {\mathrm{2591}}^1$

素因数の和:2707

約数の個数: 40

約数和(自身を含む): 50139648

約数和(自身を除く): 28789808

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 103, 206, 412, 515, 824, 1030, 1648, 2060, 2591, 4120, 5182, 8240, 10364, 12955, 20728, 25910, 41456, 51820, 103640, 207280, 266873, 533746, 1067492, 1334365, 2134984, 2668730, 4269968, 5337460, 10674920, 21349840]

約数ペア:

[(1, 21349840), (2, 10674920), (4, 5337460), (5, 4269968), (8, 2668730), (10, 2134984), (16, 1334365), (20, 1067492), (40, 533746), (80, 266873), (103, 207280), (206, 103640), (412, 51820), (515, 41456), (824, 25910), (1030, 20728), (1648, 12955), (2060, 10364), (2591, 8240), (4120, 5182)]