18788020

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{101}}^1\times {\mathrm{131}}^1$

素因数の和:312

約数の個数: 48

約数和(自身を含む): 40715136

約数和(自身を除く): 21927116

約数列:

[1, 2, 4, 5, 10, 20, 71, 101, 131, 142, 202, 262, 284, 355, 404, 505, 524, 655, 710, 1010, 1310, 1420, 2020, 2620, 7171, 9301, 13231, 14342, 18602, 26462, 28684, 35855, 37204, 46505, 52924, 66155, 71710, 93010, 132310, 143420, 186020, 264620, 939401, 1878802, 3757604, 4697005, 9394010, 18788020]

約数ペア:

[(1, 18788020), (2, 9394010), (4, 4697005), (5, 3757604), (10, 1878802), (20, 939401), (71, 264620), (101, 186020), (131, 143420), (142, 132310), (202, 93010), (262, 71710), (284, 66155), (355, 52924), (404, 46505), (505, 37204), (524, 35855), (655, 28684), (710, 26462), (1010, 18602), (1310, 14342), (1420, 13231), (2020, 9301), (2620, 7171)]