21516340

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{127}}^1\times {\mathrm{197}}^1$

素因数の和:376

約数の個数: 48

約数和(自身を含む): 46835712

約数和(自身を除く): 25319372

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 127, 172, 197, 215, 254, 394, 430, 508, 635, 788, 860, 985, 1270, 1970, 2540, 3940, 5461, 8471, 10922, 16942, 21844, 25019, 27305, 33884, 42355, 50038, 54610, 84710, 100076, 109220, 125095, 169420, 250190, 500380, 1075817, 2151634, 4303268, 5379085, 10758170, 21516340]

約数ペア:

[(1, 21516340), (2, 10758170), (4, 5379085), (5, 4303268), (10, 2151634), (20, 1075817), (43, 500380), (86, 250190), (127, 169420), (172, 125095), (197, 109220), (215, 100076), (254, 84710), (394, 54610), (430, 50038), (508, 42355), (635, 33884), (788, 27305), (860, 25019), (985, 21844), (1270, 16942), (1970, 10922), (2540, 8471), (3940, 5461)]