21251979

素因数分解:

$3^2\times 7^1\times {\mathrm{73}}^1\times {\mathrm{4621}}^1$

素因数の和:4707

約数の個数: 24

約数和(自身を含む): 35570912

約数和(自身を除く): 14318933

約数列:

[1, 3, 7, 9, 21, 63, 73, 219, 511, 657, 1533, 4599, 4621, 13863, 32347, 41589, 97041, 291123, 337333, 1011999, 2361331, 3035997, 7083993, 21251979]

約数ペア:

[(1, 21251979), (3, 7083993), (7, 3035997), (9, 2361331), (21, 1011999), (63, 337333), (73, 291123), (219, 97041), (511, 41589), (657, 32347), (1533, 13863), (4599, 4621)]