21121940

素因数分解:

$2^2\times 5^1\times 7^3\times {\mathrm{3079}}^1$

素因数の和:3109

約数の個数: 48

約数和(自身を含む): 51744000

約数和(自身を除く): 30622060

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 343, 490, 686, 980, 1372, 1715, 3079, 3430, 6158, 6860, 12316, 15395, 21553, 30790, 43106, 61580, 86212, 107765, 150871, 215530, 301742, 431060, 603484, 754355, 1056097, 1508710, 2112194, 3017420, 4224388, 5280485, 10560970, 21121940]

約数ペア:

[(1, 21121940), (2, 10560970), (4, 5280485), (5, 4224388), (7, 3017420), (10, 2112194), (14, 1508710), (20, 1056097), (28, 754355), (35, 603484), (49, 431060), (70, 301742), (98, 215530), (140, 150871), (196, 107765), (245, 86212), (343, 61580), (490, 43106), (686, 30790), (980, 21553), (1372, 15395), (1715, 12316), (3079, 6860), (3430, 6158)]