18685840

素因数分解:

$2^4\times 5^1\times {\mathrm{131}}^1\times {\mathrm{1783}}^1$

素因数の和:1927

約数の個数: 40

約数和(自身を含む): 43800768

約数和(自身を除く): 25114928

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 131, 262, 524, 655, 1048, 1310, 1783, 2096, 2620, 3566, 5240, 7132, 8915, 10480, 14264, 17830, 28528, 35660, 71320, 142640, 233573, 467146, 934292, 1167865, 1868584, 2335730, 3737168, 4671460, 9342920, 18685840]

約数ペア:

[(1, 18685840), (2, 9342920), (4, 4671460), (5, 3737168), (8, 2335730), (10, 1868584), (16, 1167865), (20, 934292), (40, 467146), (80, 233573), (131, 142640), (262, 71320), (524, 35660), (655, 28528), (1048, 17830), (1310, 14264), (1783, 10480), (2096, 8915), (2620, 7132), (3566, 5240)]