17991639

素因数分解:

$3^4\times {\mathrm{389}}^1\times {\mathrm{571}}^1$

素因数の和:972

約数の個数: 20

約数和(自身を含む): 26992680

約数和(自身を除く): 9001041

約数列:

[1, 3, 9, 27, 81, 389, 571, 1167, 1713, 3501, 5139, 10503, 15417, 31509, 46251, 222119, 666357, 1999071, 5997213, 17991639]

約数ペア:

[(1, 17991639), (3, 5997213), (9, 1999071), (27, 666357), (81, 222119), (389, 46251), (571, 31509), (1167, 15417), (1713, 10503), (3501, 5139)]