21271880

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{10853}}^1$

素因数の和:10878

約数の個数: 48

約数和(自身を含む): 55681020

約数和(自身を除く): 34409140

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 49, 56, 70, 98, 140, 196, 245, 280, 392, 490, 980, 1960, 10853, 21706, 43412, 54265, 75971, 86824, 108530, 151942, 217060, 303884, 379855, 434120, 531797, 607768, 759710, 1063594, 1519420, 2127188, 2658985, 3038840, 4254376, 5317970, 10635940, 21271880]

約数ペア:

[(1, 21271880), (2, 10635940), (4, 5317970), (5, 4254376), (7, 3038840), (8, 2658985), (10, 2127188), (14, 1519420), (20, 1063594), (28, 759710), (35, 607768), (40, 531797), (49, 434120), (56, 379855), (70, 303884), (98, 217060), (140, 151942), (196, 108530), (245, 86824), (280, 75971), (392, 54265), (490, 43412), (980, 21706), (1960, 10853)]