21213875

素因数分解:

$5^3\times {\mathrm{17}}^1\times {\mathrm{67}}^1\times {\mathrm{149}}^1$

素因数の和:248

約数の個数: 32

約数和(自身を含む): 28641600

約数和(自身を除く): 7427725

約数列:

[1, 5, 17, 25, 67, 85, 125, 149, 335, 425, 745, 1139, 1675, 2125, 2533, 3725, 5695, 8375, 9983, 12665, 18625, 28475, 49915, 63325, 142375, 169711, 249575, 316625, 848555, 1247875, 4242775, 21213875]

約数ペア:

[(1, 21213875), (5, 4242775), (17, 1247875), (25, 848555), (67, 316625), (85, 249575), (125, 169711), (149, 142375), (335, 63325), (425, 49915), (745, 28475), (1139, 18625), (1675, 12665), (2125, 9983), (2533, 8375), (3725, 5695)]