81271600

素因数分解:

$2^4\times 5^2\times {\mathrm{199}}^1\times {\mathrm{1021}}^1$

素因数の和:1238

約数の個数: 60

約数和(自身を含む): 196428400

約数和(自身を除く): 115156800

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 199, 200, 398, 400, 796, 995, 1021, 1592, 1990, 2042, 3184, 3980, 4084, 4975, 5105, 7960, 8168, 9950, 10210, 15920, 16336, 19900, 20420, 25525, 39800, 40840, 51050, 79600, 81680, 102100, 203179, 204200, 406358, 408400, 812716, 1015895, 1625432, 2031790, 3250864, 4063580, 5079475, 8127160, 10158950, 16254320, 20317900, 40635800, 81271600]

約数ペア:

[(1, 81271600), (2, 40635800), (4, 20317900), (5, 16254320), (8, 10158950), (10, 8127160), (16, 5079475), (20, 4063580), (25, 3250864), (40, 2031790), (50, 1625432), (80, 1015895), (100, 812716), (199, 408400), (200, 406358), (398, 204200), (400, 203179), (796, 102100), (995, 81680), (1021, 79600), (1592, 51050), (1990, 40840), (2042, 39800), (3184, 25525), (3980, 20420), (4084, 19900), (4975, 16336), (5105, 15920), (7960, 10210), (8168, 9950)]