21404979

素因数分解:

$3^4\times {\mathrm{401}}^1\times {\mathrm{659}}^1$

素因数の和:1072

約数の個数: 20

約数和(自身を含む): 32103720

約数和(自身を除く): 10698741

約数列:

[1, 3, 9, 27, 81, 401, 659, 1203, 1977, 3609, 5931, 10827, 17793, 32481, 53379, 264259, 792777, 2378331, 7134993, 21404979]

約数ペア:

[(1, 21404979), (3, 7134993), (9, 2378331), (27, 792777), (81, 264259), (401, 53379), (659, 32481), (1203, 17793), (1977, 10827), (3609, 5931)]