21456680

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{76631}}^1$

素因数の和:76649

約数の個数: 32

約数和(自身を含む): 55175040

約数和(自身を除く): 33718360

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 76631, 153262, 306524, 383155, 536417, 613048, 766310, 1072834, 1532620, 2145668, 2682085, 3065240, 4291336, 5364170, 10728340, 21456680]

約数ペア:

[(1, 21456680), (2, 10728340), (4, 5364170), (5, 4291336), (7, 3065240), (8, 2682085), (10, 2145668), (14, 1532620), (20, 1072834), (28, 766310), (35, 613048), (40, 536417), (56, 383155), (70, 306524), (140, 153262), (280, 76631)]