21015605

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{73}}^1\times {\mathrm{103}}^1$

素因数の和:237

約数の個数: 32

約数和(自身を含む): 28444416

約数和(自身を除く): 7428811

約数列:

[1, 5, 13, 43, 65, 73, 103, 215, 365, 515, 559, 949, 1339, 2795, 3139, 4429, 4745, 6695, 7519, 15695, 22145, 37595, 40807, 57577, 97747, 204035, 287885, 323317, 488735, 1616585, 4203121, 21015605]

約数ペア:

[(1, 21015605), (5, 4203121), (13, 1616585), (43, 488735), (65, 323317), (73, 287885), (103, 204035), (215, 97747), (365, 57577), (515, 40807), (559, 37595), (949, 22145), (1339, 15695), (2795, 7519), (3139, 6695), (4429, 4745)]