21071745

素因数分解:

$3^7\times 5^1\times {\mathrm{41}}^1\times {\mathrm{47}}^1$

素因数の和:114

約数の個数: 64

約数和(自身を含む): 39674880

約数和(自身を除く): 18603135

約数列:

[1, 3, 5, 9, 15, 27, 41, 45, 47, 81, 123, 135, 141, 205, 235, 243, 369, 405, 423, 615, 705, 729, 1107, 1215, 1269, 1845, 1927, 2115, 2187, 3321, 3645, 3807, 5535, 5781, 6345, 9635, 9963, 10935, 11421, 16605, 17343, 19035, 28905, 29889, 34263, 49815, 52029, 57105, 86715, 89667, 102789, 149445, 156087, 171315, 260145, 448335, 468261, 513945, 780435, 1404783, 2341305, 4214349, 7023915, 21071745]

約数ペア:

[(1, 21071745), (3, 7023915), (5, 4214349), (9, 2341305), (15, 1404783), (27, 780435), (41, 513945), (45, 468261), (47, 448335), (81, 260145), (123, 171315), (135, 156087), (141, 149445), (205, 102789), (235, 89667), (243, 86715), (369, 57105), (405, 52029), (423, 49815), (615, 34263), (705, 29889), (729, 28905), (1107, 19035), (1215, 17343), (1269, 16605), (1845, 11421), (1927, 10935), (2115, 9963), (2187, 9635), (3321, 6345), (3645, 5781), (3807, 5535)]