21115615

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{73}}^1\times {\mathrm{83}}^1$

素因数の和:219

約数の個数: 32

約数和(自身を含む): 28195776

約数和(自身を除く): 7080161

約数列:

[1, 5, 17, 41, 73, 83, 85, 205, 365, 415, 697, 1241, 1411, 2993, 3403, 3485, 6059, 6205, 7055, 14965, 17015, 30295, 50881, 57851, 103003, 248419, 254405, 289255, 515015, 1242095, 4223123, 21115615]

約数ペア:

[(1, 21115615), (5, 4223123), (17, 1242095), (41, 515015), (73, 289255), (83, 254405), (85, 248419), (205, 103003), (365, 57851), (415, 50881), (697, 30295), (1241, 17015), (1411, 14965), (2993, 7055), (3403, 6205), (3485, 6059)]