21239739

素因数分解:

$3^4\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{373}}^1$

素因数の和:441

約数の個数: 40

約数和(自身を含む): 34393040

約数和(自身を除く): 13153301

約数列:

[1, 3, 9, 19, 27, 37, 57, 81, 111, 171, 333, 373, 513, 703, 999, 1119, 1539, 2109, 2997, 3357, 6327, 7087, 10071, 13801, 18981, 21261, 30213, 41403, 56943, 63783, 124209, 191349, 262219, 372627, 574047, 786657, 1117881, 2359971, 7079913, 21239739]

約数ペア:

[(1, 21239739), (3, 7079913), (9, 2359971), (19, 1117881), (27, 786657), (37, 574047), (57, 372627), (81, 262219), (111, 191349), (171, 124209), (333, 63783), (373, 56943), (513, 41403), (703, 30213), (999, 21261), (1119, 18981), (1539, 13801), (2109, 10071), (2997, 7087), (3357, 6327)]