21778309

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{73}}^1\times {\mathrm{109}}^1$

素因数の和:229

約数の個数: 32

約数和(自身を含む): 28131840

約数和(自身を除く): 6353531

約数列:

[1, 7, 17, 23, 73, 109, 119, 161, 391, 511, 763, 1241, 1679, 1853, 2507, 2737, 7957, 8687, 11753, 12971, 17549, 28543, 42619, 55699, 135269, 183011, 199801, 298333, 946883, 1281077, 3111187, 21778309]

約数ペア:

[(1, 21778309), (7, 3111187), (17, 1281077), (23, 946883), (73, 298333), (109, 199801), (119, 183011), (161, 135269), (391, 55699), (511, 42619), (763, 28543), (1241, 17549), (1679, 12971), (1853, 11753), (2507, 8687), (2737, 7957)]