21898520

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{197}}^1\times {\mathrm{397}}^1$

素因数の和:612

約数の個数: 64

約数和(自身を含む): 56738880

約数和(自身を除く): 34840360

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 197, 280, 394, 397, 788, 794, 985, 1379, 1576, 1588, 1970, 1985, 2758, 2779, 3176, 3940, 3970, 5516, 5558, 6895, 7880, 7940, 11032, 11116, 13790, 13895, 15880, 22232, 27580, 27790, 55160, 55580, 78209, 111160, 156418, 312836, 391045, 547463, 625672, 782090, 1094926, 1564180, 2189852, 2737315, 3128360, 4379704, 5474630, 10949260, 21898520]

約数ペア:

[(1, 21898520), (2, 10949260), (4, 5474630), (5, 4379704), (7, 3128360), (8, 2737315), (10, 2189852), (14, 1564180), (20, 1094926), (28, 782090), (35, 625672), (40, 547463), (56, 391045), (70, 312836), (140, 156418), (197, 111160), (280, 78209), (394, 55580), (397, 55160), (788, 27790), (794, 27580), (985, 22232), (1379, 15880), (1576, 13895), (1588, 13790), (1970, 11116), (1985, 11032), (2758, 7940), (2779, 7880), (3176, 6895), (3940, 5558), (3970, 5516)]