21486320

素因数分解:

$2^4\times 5^1\times {\mathrm{419}}^1\times {\mathrm{641}}^1$

素因数の和:1073

約数の個数: 40

約数和(自身を含む): 50153040

約数和(自身を除く): 28666720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 419, 641, 838, 1282, 1676, 2095, 2564, 3205, 3352, 4190, 5128, 6410, 6704, 8380, 10256, 12820, 16760, 25640, 33520, 51280, 268579, 537158, 1074316, 1342895, 2148632, 2685790, 4297264, 5371580, 10743160, 21486320]

約数ペア:

[(1, 21486320), (2, 10743160), (4, 5371580), (5, 4297264), (8, 2685790), (10, 2148632), (16, 1342895), (20, 1074316), (40, 537158), (80, 268579), (419, 51280), (641, 33520), (838, 25640), (1282, 16760), (1676, 12820), (2095, 10256), (2564, 8380), (3205, 6704), (3352, 6410), (4190, 5128)]