81217640

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{431}}^1\times {\mathrm{673}}^1$

素因数の和:1122

約数の個数: 64

約数和(自身を含む): 209640960

約数和(自身を除く): 128423320

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 431, 673, 862, 1346, 1724, 2155, 2692, 3017, 3365, 3448, 4310, 4711, 5384, 6034, 6730, 8620, 9422, 12068, 13460, 15085, 17240, 18844, 23555, 24136, 26920, 30170, 37688, 47110, 60340, 94220, 120680, 188440, 290063, 580126, 1160252, 1450315, 2030441, 2320504, 2900630, 4060882, 5801260, 8121764, 10152205, 11602520, 16243528, 20304410, 40608820, 81217640]

約数ペア:

[(1, 81217640), (2, 40608820), (4, 20304410), (5, 16243528), (7, 11602520), (8, 10152205), (10, 8121764), (14, 5801260), (20, 4060882), (28, 2900630), (35, 2320504), (40, 2030441), (56, 1450315), (70, 1160252), (140, 580126), (280, 290063), (431, 188440), (673, 120680), (862, 94220), (1346, 60340), (1724, 47110), (2155, 37688), (2692, 30170), (3017, 26920), (3365, 24136), (3448, 23555), (4310, 18844), (4711, 17240), (5384, 15085), (6034, 13460), (6730, 12068), (8620, 9422)]