21990717

素因数分解:

$3^3\times 7^1\times {\mathrm{307}}^1\times {\mathrm{379}}^1$

素因数の和:702

約数の個数: 32

約数和(自身を含む): 37452800

約数和(自身を除く): 15462083

約数列:

[1, 3, 7, 9, 21, 27, 63, 189, 307, 379, 921, 1137, 2149, 2653, 2763, 3411, 6447, 7959, 8289, 10233, 19341, 23877, 58023, 71631, 116353, 349059, 814471, 1047177, 2443413, 3141531, 7330239, 21990717]

約数ペア:

[(1, 21990717), (3, 7330239), (7, 3141531), (9, 2443413), (21, 1047177), (27, 814471), (63, 349059), (189, 116353), (307, 71631), (379, 58023), (921, 23877), (1137, 19341), (2149, 10233), (2653, 8289), (2763, 7959), (3411, 6447)]