21917745

素因数分解:

$3^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{47}}^1\times {\mathrm{241}}^1$

素因数の和:342

約数の個数: 48

約数和(自身を含む): 39866112

約数和(自身を除く): 17948367

約数列:

[1, 3, 5, 9, 15, 43, 45, 47, 129, 141, 215, 235, 241, 387, 423, 645, 705, 723, 1205, 1935, 2021, 2115, 2169, 3615, 6063, 10105, 10363, 10845, 11327, 18189, 30315, 31089, 33981, 51815, 56635, 90945, 93267, 101943, 155445, 169905, 466335, 487061, 509715, 1461183, 2435305, 4383549, 7305915, 21917745]

約数ペア:

[(1, 21917745), (3, 7305915), (5, 4383549), (9, 2435305), (15, 1461183), (43, 509715), (45, 487061), (47, 466335), (129, 169905), (141, 155445), (215, 101943), (235, 93267), (241, 90945), (387, 56635), (423, 51815), (645, 33981), (705, 31089), (723, 30315), (1205, 18189), (1935, 11327), (2021, 10845), (2115, 10363), (2169, 10105), (3615, 6063)]