21688360

素因数分解:

$2^3\times 5^1\times {\mathrm{131}}^1\times {\mathrm{4139}}^1$

素因数の和:4281

約数の個数: 32

約数和(自身を含む): 49183200

約数和(自身を除く): 27494840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 131, 262, 524, 655, 1048, 1310, 2620, 4139, 5240, 8278, 16556, 20695, 33112, 41390, 82780, 165560, 542209, 1084418, 2168836, 2711045, 4337672, 5422090, 10844180, 21688360]

約数ペア:

[(1, 21688360), (2, 10844180), (4, 5422090), (5, 4337672), (8, 2711045), (10, 2168836), (20, 1084418), (40, 542209), (131, 165560), (262, 82780), (524, 41390), (655, 33112), (1048, 20695), (1310, 16556), (2620, 8278), (4139, 5240)]