21188104

素因数分解:

$2^3\times 7^1\times {\mathrm{71}}^1\times {\mathrm{73}}^2$

素因数の和:230

約数の個数: 48

約数和(自身を含む): 46681920

約数和(自身を除く): 25493816

約数列:

[1, 2, 4, 7, 8, 14, 28, 56, 71, 73, 142, 146, 284, 292, 497, 511, 568, 584, 994, 1022, 1988, 2044, 3976, 4088, 5183, 5329, 10366, 10658, 20732, 21316, 36281, 37303, 41464, 42632, 72562, 74606, 145124, 149212, 290248, 298424, 378359, 756718, 1513436, 2648513, 3026872, 5297026, 10594052, 21188104]

約数ペア:

[(1, 21188104), (2, 10594052), (4, 5297026), (7, 3026872), (8, 2648513), (14, 1513436), (28, 756718), (56, 378359), (71, 298424), (73, 290248), (142, 149212), (146, 145124), (284, 74606), (292, 72562), (497, 42632), (511, 41464), (568, 37303), (584, 36281), (994, 21316), (1022, 20732), (1988, 10658), (2044, 10366), (3976, 5329), (4088, 5183)]