21071380

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{71}}^2$

素因数の和:181

約数の個数: 72

約数和(自身を含む): 51539040

約数和(自身を除く): 30467660

約数列:

[1, 2, 4, 5, 10, 11, 19, 20, 22, 38, 44, 55, 71, 76, 95, 110, 142, 190, 209, 220, 284, 355, 380, 418, 710, 781, 836, 1045, 1349, 1420, 1562, 2090, 2698, 3124, 3905, 4180, 5041, 5396, 6745, 7810, 10082, 13490, 14839, 15620, 20164, 25205, 26980, 29678, 50410, 55451, 59356, 74195, 95779, 100820, 110902, 148390, 191558, 221804, 277255, 296780, 383116, 478895, 554510, 957790, 1053569, 1109020, 1915580, 2107138, 4214276, 5267845, 10535690, 21071380]

約数ペア:

[(1, 21071380), (2, 10535690), (4, 5267845), (5, 4214276), (10, 2107138), (11, 1915580), (19, 1109020), (20, 1053569), (22, 957790), (38, 554510), (44, 478895), (55, 383116), (71, 296780), (76, 277255), (95, 221804), (110, 191558), (142, 148390), (190, 110902), (209, 100820), (220, 95779), (284, 74195), (355, 59356), (380, 55451), (418, 50410), (710, 29678), (781, 26980), (836, 25205), (1045, 20164), (1349, 15620), (1420, 14839), (1562, 13490), (2090, 10082), (2698, 7810), (3124, 6745), (3905, 5396), (4180, 5041)]