21002440

素因数分解:

$2^3\times 5^1\times {\mathrm{97}}^1\times {\mathrm{5413}}^1$

素因数の和:5521

約数の個数: 32

約数和(自身を含む): 47751480

約数和(自身を除く): 26749040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 97, 194, 388, 485, 776, 970, 1940, 3880, 5413, 10826, 21652, 27065, 43304, 54130, 108260, 216520, 525061, 1050122, 2100244, 2625305, 4200488, 5250610, 10501220, 21002440]

約数ペア:

[(1, 21002440), (2, 10501220), (4, 5250610), (5, 4200488), (8, 2625305), (10, 2100244), (20, 1050122), (40, 525061), (97, 216520), (194, 108260), (388, 54130), (485, 43304), (776, 27065), (970, 21652), (1940, 10826), (3880, 5413)]