21021980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{1129}}^1$

素因数の和:1171

約数の個数: 72

約数和(自身を含む): 54104400

約数和(自身を除く): 33082420

約数列:

[1, 2, 4, 5, 7, 10, 14, 19, 20, 28, 35, 38, 49, 70, 76, 95, 98, 133, 140, 190, 196, 245, 266, 380, 490, 532, 665, 931, 980, 1129, 1330, 1862, 2258, 2660, 3724, 4516, 4655, 5645, 7903, 9310, 11290, 15806, 18620, 21451, 22580, 31612, 39515, 42902, 55321, 79030, 85804, 107255, 110642, 150157, 158060, 214510, 221284, 276605, 300314, 429020, 553210, 600628, 750785, 1051099, 1106420, 1501570, 2102198, 3003140, 4204396, 5255495, 10510990, 21021980]

約数ペア:

[(1, 21021980), (2, 10510990), (4, 5255495), (5, 4204396), (7, 3003140), (10, 2102198), (14, 1501570), (19, 1106420), (20, 1051099), (28, 750785), (35, 600628), (38, 553210), (49, 429020), (70, 300314), (76, 276605), (95, 221284), (98, 214510), (133, 158060), (140, 150157), (190, 110642), (196, 107255), (245, 85804), (266, 79030), (380, 55321), (490, 42902), (532, 39515), (665, 31612), (931, 22580), (980, 21451), (1129, 18620), (1330, 15806), (1862, 11290), (2258, 9310), (2660, 7903), (3724, 5645), (4516, 4655)]