21555880

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{113}}^1\times {\mathrm{251}}^1$

素因数の和:394

約数の個数: 64

約数和(自身を含む): 51710400

約数和(自身を除く): 30154520

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 95, 113, 152, 190, 226, 251, 380, 452, 502, 565, 760, 904, 1004, 1130, 1255, 2008, 2147, 2260, 2510, 4294, 4520, 4769, 5020, 8588, 9538, 10040, 10735, 17176, 19076, 21470, 23845, 28363, 38152, 42940, 47690, 56726, 85880, 95380, 113452, 141815, 190760, 226904, 283630, 538897, 567260, 1077794, 1134520, 2155588, 2694485, 4311176, 5388970, 10777940, 21555880]

約数ペア:

[(1, 21555880), (2, 10777940), (4, 5388970), (5, 4311176), (8, 2694485), (10, 2155588), (19, 1134520), (20, 1077794), (38, 567260), (40, 538897), (76, 283630), (95, 226904), (113, 190760), (152, 141815), (190, 113452), (226, 95380), (251, 85880), (380, 56726), (452, 47690), (502, 42940), (565, 38152), (760, 28363), (904, 23845), (1004, 21470), (1130, 19076), (1255, 17176), (2008, 10735), (2147, 10040), (2260, 9538), (2510, 8588), (4294, 5020), (4520, 4769)]