21851620

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{127}}^1\times {\mathrm{1229}}^1$

素因数の和:1372

約数の個数: 48

約数和(自身を含む): 52899840

約数和(自身を除く): 31048220

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 127, 140, 254, 508, 635, 889, 1229, 1270, 1778, 2458, 2540, 3556, 4445, 4916, 6145, 8603, 8890, 12290, 17206, 17780, 24580, 34412, 43015, 86030, 156083, 172060, 312166, 624332, 780415, 1092581, 1560830, 2185162, 3121660, 4370324, 5462905, 10925810, 21851620]

約数ペア:

[(1, 21851620), (2, 10925810), (4, 5462905), (5, 4370324), (7, 3121660), (10, 2185162), (14, 1560830), (20, 1092581), (28, 780415), (35, 624332), (70, 312166), (127, 172060), (140, 156083), (254, 86030), (508, 43015), (635, 34412), (889, 24580), (1229, 17780), (1270, 17206), (1778, 12290), (2458, 8890), (2540, 8603), (3556, 6145), (4445, 4916)]