21365715

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{41}}^1\times {\mathrm{709}}^1$

素因数の和:772

約数の個数: 48

約数和(自身を含む): 40793760

約数和(自身を除く): 19428045

約数列:

[1, 3, 5, 7, 15, 21, 35, 41, 49, 105, 123, 147, 205, 245, 287, 615, 709, 735, 861, 1435, 2009, 2127, 3545, 4305, 4963, 6027, 10045, 10635, 14889, 24815, 29069, 30135, 34741, 74445, 87207, 104223, 145345, 173705, 203483, 436035, 521115, 610449, 1017415, 1424381, 3052245, 4273143, 7121905, 21365715]

約数ペア:

[(1, 21365715), (3, 7121905), (5, 4273143), (7, 3052245), (15, 1424381), (21, 1017415), (35, 610449), (41, 521115), (49, 436035), (105, 203483), (123, 173705), (147, 145345), (205, 104223), (245, 87207), (287, 74445), (615, 34741), (709, 30135), (735, 29069), (861, 24815), (1435, 14889), (2009, 10635), (2127, 10045), (3545, 6027), (4305, 4963)]