21054369

素因数分解:

$3^1\times 7^4\times {\mathrm{37}}^1\times {\mathrm{79}}^1$

素因数の和:147

約数の個数: 40

約数和(自身を含む): 34060160

約数和(自身を除く): 13005791

約数列:

[1, 3, 7, 21, 37, 49, 79, 111, 147, 237, 259, 343, 553, 777, 1029, 1659, 1813, 2401, 2923, 3871, 5439, 7203, 8769, 11613, 12691, 20461, 27097, 38073, 61383, 81291, 88837, 143227, 189679, 266511, 429681, 569037, 1002589, 3007767, 7018123, 21054369]

約数ペア:

[(1, 21054369), (3, 7018123), (7, 3007767), (21, 1002589), (37, 569037), (49, 429681), (79, 266511), (111, 189679), (147, 143227), (237, 88837), (259, 81291), (343, 61383), (553, 38073), (777, 27097), (1029, 20461), (1659, 12691), (1813, 11613), (2401, 8769), (2923, 7203), (3871, 5439)]