21287988

素因数分解:

$2^2\times 3^3\times {\mathrm{439}}^1\times {\mathrm{449}}^1$

素因数の和:901

約数の個数: 48

約数和(自身を含む): 55440000

約数和(自身を除く): 34152012

約数列:

[1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, 108, 439, 449, 878, 898, 1317, 1347, 1756, 1796, 2634, 2694, 3951, 4041, 5268, 5388, 7902, 8082, 11853, 12123, 15804, 16164, 23706, 24246, 47412, 48492, 197111, 394222, 591333, 788444, 1182666, 1773999, 2365332, 3547998, 5321997, 7095996, 10643994, 21287988]

約数ペア:

[(1, 21287988), (2, 10643994), (3, 7095996), (4, 5321997), (6, 3547998), (9, 2365332), (12, 1773999), (18, 1182666), (27, 788444), (36, 591333), (54, 394222), (108, 197111), (439, 48492), (449, 47412), (878, 24246), (898, 23706), (1317, 16164), (1347, 15804), (1756, 12123), (1796, 11853), (2634, 8082), (2694, 7902), (3951, 5388), (4041, 5268)]