21490840

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{76753}}^1$

素因数の和:76771

約数の個数: 32

約数和(自身を含む): 55262880

約数和(自身を除く): 33772040

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 76753, 153506, 307012, 383765, 537271, 614024, 767530, 1074542, 1535060, 2149084, 2686355, 3070120, 4298168, 5372710, 10745420, 21490840]

約数ペア:

[(1, 21490840), (2, 10745420), (4, 5372710), (5, 4298168), (7, 3070120), (8, 2686355), (10, 2149084), (14, 1535060), (20, 1074542), (28, 767530), (35, 614024), (40, 537271), (56, 383765), (70, 307012), (140, 153506), (280, 76753)]