21128931

素因数分解:

$3^4\times {\mathrm{19}}^1\times {\mathrm{13729}}^1$

素因数の和:13760

約数の個数: 20

約数和(自身を含む): 33226600

約数和(自身を除く): 12097669

約数列:

[1, 3, 9, 19, 27, 57, 81, 171, 513, 1539, 13729, 41187, 123561, 260851, 370683, 782553, 1112049, 2347659, 7042977, 21128931]

約数ペア:

[(1, 21128931), (3, 7042977), (9, 2347659), (19, 1112049), (27, 782553), (57, 370683), (81, 260851), (171, 123561), (513, 41187), (1539, 13729)]