21347755

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{73}}^1\times {\mathrm{409}}^1$

素因数の和:511

約数の個数: 32

約数和(自身を含む): 30582720

約数和(自身を除く): 9234965

約数列:

[1, 5, 11, 13, 55, 65, 73, 143, 365, 409, 715, 803, 949, 2045, 4015, 4499, 4745, 5317, 10439, 22495, 26585, 29857, 52195, 58487, 149285, 292435, 328427, 388141, 1642135, 1940705, 4269551, 21347755]

約数ペア:

[(1, 21347755), (5, 4269551), (11, 1940705), (13, 1642135), (55, 388141), (65, 328427), (73, 292435), (143, 149285), (365, 58487), (409, 52195), (715, 29857), (803, 26585), (949, 22495), (2045, 10439), (4015, 5317), (4499, 4745)]