18720940

素因数分解:

$2^2\times 5^1\times 7^3\times {\mathrm{2729}}^1$

素因数の和:2759

約数の個数: 48

約数和(自身を含む): 45864000

約数和(自身を除く): 27143060

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, 2729, 3430, 5458, 6860, 10916, 13645, 19103, 27290, 38206, 54580, 76412, 95515, 133721, 191030, 267442, 382060, 534884, 668605, 936047, 1337210, 1872094, 2674420, 3744188, 4680235, 9360470, 18720940]

約数ペア:

[(1, 18720940), (2, 9360470), (4, 4680235), (5, 3744188), (7, 2674420), (10, 1872094), (14, 1337210), (20, 936047), (28, 668605), (35, 534884), (49, 382060), (70, 267442), (98, 191030), (140, 133721), (196, 95515), (245, 76412), (343, 54580), (490, 38206), (686, 27290), (980, 19103), (1372, 13645), (1715, 10916), (2729, 6860), (3430, 5458)]