21287560

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{10861}}^1$

素因数の和:10886

約数の個数: 48

約数和(自身を含む): 55722060

約数和(自身を除く): 34434500

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 49, 56, 70, 98, 140, 196, 245, 280, 392, 490, 980, 1960, 10861, 21722, 43444, 54305, 76027, 86888, 108610, 152054, 217220, 304108, 380135, 434440, 532189, 608216, 760270, 1064378, 1520540, 2128756, 2660945, 3041080, 4257512, 5321890, 10643780, 21287560]

約数ペア:

[(1, 21287560), (2, 10643780), (4, 5321890), (5, 4257512), (7, 3041080), (8, 2660945), (10, 2128756), (14, 1520540), (20, 1064378), (28, 760270), (35, 608216), (40, 532189), (49, 434440), (56, 380135), (70, 304108), (98, 217220), (140, 152054), (196, 108610), (245, 86888), (280, 76027), (392, 54305), (490, 43444), (980, 21722), (1960, 10861)]