21654280

素因数分解:

$2^3\times 5^1\times {\mathrm{97}}^1\times {\mathrm{5581}}^1$

素因数の和:5689

約数の個数: 32

約数和(自身を含む): 49233240

約数和(自身を除く): 27578960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 97, 194, 388, 485, 776, 970, 1940, 3880, 5581, 11162, 22324, 27905, 44648, 55810, 111620, 223240, 541357, 1082714, 2165428, 2706785, 4330856, 5413570, 10827140, 21654280]

約数ペア:

[(1, 21654280), (2, 10827140), (4, 5413570), (5, 4330856), (8, 2706785), (10, 2165428), (20, 1082714), (40, 541357), (97, 223240), (194, 111620), (388, 55810), (485, 44648), (776, 27905), (970, 22324), (1940, 11162), (3880, 5581)]