21155515

素因数分解:

$5^1\times {\mathrm{23}}^1\times {\mathrm{71}}^1\times {\mathrm{2591}}^1$

素因数の和:2690

約数の個数: 16

約数和(自身を含む): 26873856

約数和(自身を除く): 5718341

約数列:

[1, 5, 23, 71, 115, 355, 1633, 2591, 8165, 12955, 59593, 183961, 297965, 919805, 4231103, 21155515]

約数ペア:

[(1, 21155515), (5, 4231103), (23, 919805), (71, 297965), (115, 183961), (355, 59593), (1633, 12955), (2591, 8165)]