21608125

素因数分解:

$5^4\times 7^1\times {\mathrm{11}}^1\times {\mathrm{449}}^1$

素因数の和:487

約数の個数: 40

約数和(自身を含む): 33739200

約数和(自身を除く): 12131075

約数列:

[1, 5, 7, 11, 25, 35, 55, 77, 125, 175, 275, 385, 449, 625, 875, 1375, 1925, 2245, 3143, 4375, 4939, 6875, 9625, 11225, 15715, 24695, 34573, 48125, 56125, 78575, 123475, 172865, 280625, 392875, 617375, 864325, 1964375, 3086875, 4321625, 21608125]

約数ペア:

[(1, 21608125), (5, 4321625), (7, 3086875), (11, 1964375), (25, 864325), (35, 617375), (55, 392875), (77, 280625), (125, 172865), (175, 123475), (275, 78575), (385, 56125), (449, 48125), (625, 34573), (875, 24695), (1375, 15715), (1925, 11225), (2245, 9625), (3143, 6875), (4375, 4939)]