21990320

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{24989}}^1$

素因数の和:25013

約数の個数: 40

約数和(自身を含む): 55777680

約数和(自身を除く): 33787360

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 110, 176, 220, 440, 880, 24989, 49978, 99956, 124945, 199912, 249890, 274879, 399824, 499780, 549758, 999560, 1099516, 1374395, 1999120, 2199032, 2748790, 4398064, 5497580, 10995160, 21990320]

約数ペア:

[(1, 21990320), (2, 10995160), (4, 5497580), (5, 4398064), (8, 2748790), (10, 2199032), (11, 1999120), (16, 1374395), (20, 1099516), (22, 999560), (40, 549758), (44, 499780), (55, 399824), (80, 274879), (88, 249890), (110, 199912), (176, 124945), (220, 99956), (440, 49978), (880, 24989)]