21906460

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{89}}^1\times {\mathrm{397}}^1$

素因数の和:526

約数の個数: 48

約数和(自身を含む): 48142080

約数和(自身を除く): 26235620

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 89, 124, 155, 178, 310, 356, 397, 445, 620, 794, 890, 1588, 1780, 1985, 2759, 3970, 5518, 7940, 11036, 12307, 13795, 24614, 27590, 35333, 49228, 55180, 61535, 70666, 123070, 141332, 176665, 246140, 353330, 706660, 1095323, 2190646, 4381292, 5476615, 10953230, 21906460]

約数ペア:

[(1, 21906460), (2, 10953230), (4, 5476615), (5, 4381292), (10, 2190646), (20, 1095323), (31, 706660), (62, 353330), (89, 246140), (124, 176665), (155, 141332), (178, 123070), (310, 70666), (356, 61535), (397, 55180), (445, 49228), (620, 35333), (794, 27590), (890, 24614), (1588, 13795), (1780, 12307), (1985, 11036), (2759, 7940), (3970, 5518)]