21256715

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{83}}^1\times {\mathrm{131}}^1$

素因数の和:259

約数の個数: 32

約数和(自身を含む): 28740096

約数和(自身を除く): 7483381

約数列:

[1, 5, 17, 23, 83, 85, 115, 131, 391, 415, 655, 1411, 1909, 1955, 2227, 3013, 7055, 9545, 10873, 11135, 15065, 32453, 51221, 54365, 162265, 184841, 250079, 256105, 924205, 1250395, 4251343, 21256715]

約数ペア:

[(1, 21256715), (5, 4251343), (17, 1250395), (23, 924205), (83, 256105), (85, 250079), (115, 184841), (131, 162265), (391, 54365), (415, 51221), (655, 32453), (1411, 15065), (1909, 11135), (1955, 10873), (2227, 9545), (3013, 7055)]