20644820

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{239}}^1\times {\mathrm{617}}^1$

素因数の和:872

約数の個数: 48

約数和(自身を含む): 49835520

約数和(自身を除く): 29190700

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 239, 478, 617, 956, 1195, 1234, 1673, 2390, 2468, 3085, 3346, 4319, 4780, 6170, 6692, 8365, 8638, 12340, 16730, 17276, 21595, 33460, 43190, 86380, 147463, 294926, 589852, 737315, 1032241, 1474630, 2064482, 2949260, 4128964, 5161205, 10322410, 20644820]

約数ペア:

[(1, 20644820), (2, 10322410), (4, 5161205), (5, 4128964), (7, 2949260), (10, 2064482), (14, 1474630), (20, 1032241), (28, 737315), (35, 589852), (70, 294926), (140, 147463), (239, 86380), (478, 43190), (617, 33460), (956, 21595), (1195, 17276), (1234, 16730), (1673, 12340), (2390, 8638), (2468, 8365), (3085, 6692), (3346, 6170), (4319, 4780)]