21206775

素因数分解:

$3^1\times 5^2\times {\mathrm{157}}^1\times {\mathrm{1801}}^1$

素因数の和:1971

約数の個数: 24

約数和(自身を含む): 35304784

約数和(自身を除く): 14098009

約数列:

[1, 3, 5, 15, 25, 75, 157, 471, 785, 1801, 2355, 3925, 5403, 9005, 11775, 27015, 45025, 135075, 282757, 848271, 1413785, 4241355, 7068925, 21206775]

約数ペア:

[(1, 21206775), (3, 7068925), (5, 4241355), (15, 1413785), (25, 848271), (75, 282757), (157, 135075), (471, 45025), (785, 27015), (1801, 11775), (2355, 9005), (3925, 5403)]