21721880

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{73}}^1\times {\mathrm{173}}^1$

素因数の和:300

約数の個数: 64

約数和(自身を含む): 50988960

約数和(自身を除く): 29267080

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 73, 86, 146, 172, 173, 215, 292, 344, 346, 365, 430, 584, 692, 730, 860, 865, 1384, 1460, 1720, 1730, 2920, 3139, 3460, 6278, 6920, 7439, 12556, 12629, 14878, 15695, 25112, 25258, 29756, 31390, 37195, 50516, 59512, 62780, 63145, 74390, 101032, 125560, 126290, 148780, 252580, 297560, 505160, 543047, 1086094, 2172188, 2715235, 4344376, 5430470, 10860940, 21721880]

約数ペア:

[(1, 21721880), (2, 10860940), (4, 5430470), (5, 4344376), (8, 2715235), (10, 2172188), (20, 1086094), (40, 543047), (43, 505160), (73, 297560), (86, 252580), (146, 148780), (172, 126290), (173, 125560), (215, 101032), (292, 74390), (344, 63145), (346, 62780), (365, 59512), (430, 50516), (584, 37195), (692, 31390), (730, 29756), (860, 25258), (865, 25112), (1384, 15695), (1460, 14878), (1720, 12629), (1730, 12556), (2920, 7439), (3139, 6920), (3460, 6278)]