21917155

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{73}}^1\times {\mathrm{149}}^1$

素因数の和:271

約数の個数: 32

約数和(自身を含む): 29836800

約数和(自身を除く): 7919645

約数列:

[1, 5, 13, 31, 65, 73, 149, 155, 365, 403, 745, 949, 1937, 2015, 2263, 4619, 4745, 9685, 10877, 11315, 23095, 29419, 54385, 60047, 141401, 147095, 300235, 337187, 707005, 1685935, 4383431, 21917155]

約数ペア:

[(1, 21917155), (5, 4383431), (13, 1685935), (31, 707005), (65, 337187), (73, 300235), (149, 147095), (155, 141401), (365, 60047), (403, 54385), (745, 29419), (949, 23095), (1937, 11315), (2015, 10877), (2263, 9685), (4619, 4745)]