21398553

素因数分解:

$3^3\times {\mathrm{11}}^1\times {\mathrm{109}}^1\times {\mathrm{661}}^1$

素因数の和:790

約数の個数: 32

約数和(自身を含む): 34953600

約数和(自身を除く): 13555047

約数列:

[1, 3, 9, 11, 27, 33, 99, 109, 297, 327, 661, 981, 1199, 1983, 2943, 3597, 5949, 7271, 10791, 17847, 21813, 32373, 65439, 72049, 196317, 216147, 648441, 792539, 1945323, 2377617, 7132851, 21398553]

約数ペア:

[(1, 21398553), (3, 7132851), (9, 2377617), (11, 1945323), (27, 792539), (33, 648441), (99, 216147), (109, 196317), (297, 72049), (327, 65439), (661, 32373), (981, 21813), (1199, 17847), (1983, 10791), (2943, 7271), (3597, 5949)]