21247821

素因数分解:

$3^2\times 7^3\times {\mathrm{6883}}^1$

素因数の和:6910

約数の個数: 24

約数和(自身を含む): 35796800

約数和(自身を除く): 14548979

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 343, 441, 1029, 3087, 6883, 20649, 48181, 61947, 144543, 337267, 433629, 1011801, 2360869, 3035403, 7082607, 21247821]

約数ペア:

[(1, 21247821), (3, 7082607), (7, 3035403), (9, 2360869), (21, 1011801), (49, 433629), (63, 337267), (147, 144543), (343, 61947), (441, 48181), (1029, 20649), (3087, 6883)]