18421220

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{89}}^1\times {\mathrm{131}}^1$

素因数の和:308

約数の個数: 48

約数和(自身を含む): 39916800

約数和(自身を除く): 21495580

約数列:

[1, 2, 4, 5, 10, 20, 79, 89, 131, 158, 178, 262, 316, 356, 395, 445, 524, 655, 790, 890, 1310, 1580, 1780, 2620, 7031, 10349, 11659, 14062, 20698, 23318, 28124, 35155, 41396, 46636, 51745, 58295, 70310, 103490, 116590, 140620, 206980, 233180, 921061, 1842122, 3684244, 4605305, 9210610, 18421220]

約数ペア:

[(1, 18421220), (2, 9210610), (4, 4605305), (5, 3684244), (10, 1842122), (20, 921061), (79, 233180), (89, 206980), (131, 140620), (158, 116590), (178, 103490), (262, 70310), (316, 58295), (356, 51745), (395, 46636), (445, 41396), (524, 35155), (655, 28124), (790, 23318), (890, 20698), (1310, 14062), (1580, 11659), (1780, 10349), (2620, 7031)]