20881840

素因数分解:

$2^4\times 5^1\times 7^3\times {\mathrm{761}}^1$

素因数の和:795

約数の個数: 80

約数和(自身を含む): 56692800

約数和(自身を除く): 35810960

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 80, 98, 112, 140, 196, 245, 280, 343, 392, 490, 560, 686, 761, 784, 980, 1372, 1522, 1715, 1960, 2744, 3044, 3430, 3805, 3920, 5327, 5488, 6088, 6860, 7610, 10654, 12176, 13720, 15220, 21308, 26635, 27440, 30440, 37289, 42616, 53270, 60880, 74578, 85232, 106540, 149156, 186445, 213080, 261023, 298312, 372890, 426160, 522046, 596624, 745780, 1044092, 1305115, 1491560, 2088184, 2610230, 2983120, 4176368, 5220460, 10440920, 20881840]

約数ペア:

[(1, 20881840), (2, 10440920), (4, 5220460), (5, 4176368), (7, 2983120), (8, 2610230), (10, 2088184), (14, 1491560), (16, 1305115), (20, 1044092), (28, 745780), (35, 596624), (40, 522046), (49, 426160), (56, 372890), (70, 298312), (80, 261023), (98, 213080), (112, 186445), (140, 149156), (196, 106540), (245, 85232), (280, 74578), (343, 60880), (392, 53270), (490, 42616), (560, 37289), (686, 30440), (761, 27440), (784, 26635), (980, 21308), (1372, 15220), (1522, 13720), (1715, 12176), (1960, 10654), (2744, 7610), (3044, 6860), (3430, 6088), (3805, 5488), (3920, 5327)]