21291140

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{4817}}^1$

素因数の和:4856

約数の個数: 48

約数和(自身を含む): 50993712

約数和(自身を除く): 29702572

約数列:

[1, 2, 4, 5, 10, 13, 17, 20, 26, 34, 52, 65, 68, 85, 130, 170, 221, 260, 340, 442, 884, 1105, 2210, 4420, 4817, 9634, 19268, 24085, 48170, 62621, 81889, 96340, 125242, 163778, 250484, 313105, 327556, 409445, 626210, 818890, 1064557, 1252420, 1637780, 2129114, 4258228, 5322785, 10645570, 21291140]

約数ペア:

[(1, 21291140), (2, 10645570), (4, 5322785), (5, 4258228), (10, 2129114), (13, 1637780), (17, 1252420), (20, 1064557), (26, 818890), (34, 626210), (52, 409445), (65, 327556), (68, 313105), (85, 250484), (130, 163778), (170, 125242), (221, 96340), (260, 81889), (340, 62621), (442, 48170), (884, 24085), (1105, 19268), (2210, 9634), (4420, 4817)]