21053776720

素因数分解:

$2^4\times 5^1\times {\mathrm{521}}^1\times {\mathrm{505129}}^1$

素因数の和:505663

約数の個数: 40

約数和(自身を含む): 49044081960

約数和(自身を除く): 27990305240

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 521, 1042, 2084, 2605, 4168, 5210, 8336, 10420, 20840, 41680, 505129, 1010258, 2020516, 2525645, 4041032, 5051290, 8082064, 10102580, 20205160, 40410320, 263172209, 526344418, 1052688836, 1315861045, 2105377672, 2631722090, 4210755344, 5263444180, 10526888360, 21053776720]

約数ペア:

[(1, 21053776720), (2, 10526888360), (4, 5263444180), (5, 4210755344), (8, 2631722090), (10, 2105377672), (16, 1315861045), (20, 1052688836), (40, 526344418), (80, 263172209), (521, 40410320), (1042, 20205160), (2084, 10102580), (2605, 8082064), (4168, 5051290), (5210, 4041032), (8336, 2525645), (10420, 2020516), (20840, 1010258), (41680, 505129)]