21009320

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{16943}}^1$

素因数の和:16985

約数の個数: 32

約数和(自身を含む): 48798720

約数和(自身を除く): 27789400

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 16943, 33886, 67772, 84715, 135544, 169430, 338860, 525233, 677720, 1050466, 2100932, 2626165, 4201864, 5252330, 10504660, 21009320]

約数ペア:

[(1, 21009320), (2, 10504660), (4, 5252330), (5, 4201864), (8, 2626165), (10, 2100932), (20, 1050466), (31, 677720), (40, 525233), (62, 338860), (124, 169430), (155, 135544), (248, 84715), (310, 67772), (620, 33886), (1240, 16943)]