21540890

素因数分解:

$2^1\times 5^1\times 7^2\times {\mathrm{43961}}^1$

素因数の和:43982

約数の個数: 24

約数和(自身を含む): 45105012

約数和(自身を除く): 23564122

約数列:

[1, 2, 5, 7, 10, 14, 35, 49, 70, 98, 245, 490, 43961, 87922, 219805, 307727, 439610, 615454, 1538635, 2154089, 3077270, 4308178, 10770445, 21540890]

約数ペア:

[(1, 21540890), (2, 10770445), (5, 4308178), (7, 3077270), (10, 2154089), (14, 1538635), (35, 615454), (49, 439610), (70, 307727), (98, 219805), (245, 87922), (490, 43961)]