21395920

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{2939}}^1$

素因数の和:2972

約数の個数: 80

約数和(自身を含む): 61246080

約数和(自身を除く): 39850160

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 20, 26, 28, 35, 40, 52, 56, 65, 70, 80, 91, 104, 112, 130, 140, 182, 208, 260, 280, 364, 455, 520, 560, 728, 910, 1040, 1456, 1820, 2939, 3640, 5878, 7280, 11756, 14695, 20573, 23512, 29390, 38207, 41146, 47024, 58780, 76414, 82292, 102865, 117560, 152828, 164584, 191035, 205730, 235120, 267449, 305656, 329168, 382070, 411460, 534898, 611312, 764140, 822920, 1069796, 1337245, 1528280, 1645840, 2139592, 2674490, 3056560, 4279184, 5348980, 10697960, 21395920]

約数ペア:

[(1, 21395920), (2, 10697960), (4, 5348980), (5, 4279184), (7, 3056560), (8, 2674490), (10, 2139592), (13, 1645840), (14, 1528280), (16, 1337245), (20, 1069796), (26, 822920), (28, 764140), (35, 611312), (40, 534898), (52, 411460), (56, 382070), (65, 329168), (70, 305656), (80, 267449), (91, 235120), (104, 205730), (112, 191035), (130, 164584), (140, 152828), (182, 117560), (208, 102865), (260, 82292), (280, 76414), (364, 58780), (455, 47024), (520, 41146), (560, 38207), (728, 29390), (910, 23512), (1040, 20573), (1456, 14695), (1820, 11756), (2939, 7280), (3640, 5878)]