21581313

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{757}}^1$

素因数の和:833

約数の個数: 32

約数和(自身を含む): 33618816

約数和(自身を除く): 12037503

約数列:

[1, 3, 13, 17, 39, 43, 51, 129, 221, 559, 663, 731, 757, 1677, 2193, 2271, 9503, 9841, 12869, 28509, 29523, 32551, 38607, 97653, 167297, 423163, 501891, 553367, 1269489, 1660101, 7193771, 21581313]

約数ペア:

[(1, 21581313), (3, 7193771), (13, 1660101), (17, 1269489), (39, 553367), (43, 501891), (51, 423163), (129, 167297), (221, 97653), (559, 38607), (663, 32551), (731, 29523), (757, 28509), (1677, 12869), (2193, 9841), (2271, 9503)]