21000687160

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8606839}}^1$

素因数の和:8606911

約数の個数: 32

約数和(自身を含む): 48026167200

約数和(自身を除く): 27025480040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8606839, 17213678, 34427356, 43034195, 68854712, 86068390, 172136780, 344273560, 525017179, 1050034358, 2100068716, 2625085895, 4200137432, 5250171790, 10500343580, 21000687160]

約数ペア:

[(1, 21000687160), (2, 10500343580), (4, 5250171790), (5, 4200137432), (8, 2625085895), (10, 2100068716), (20, 1050034358), (40, 525017179), (61, 344273560), (122, 172136780), (244, 86068390), (305, 68854712), (488, 43034195), (610, 34427356), (1220, 17213678), (2440, 8606839)]