21172804

素因数分解:

$2^2\times {\mathrm{67}}^1\times {\mathrm{199}}^1\times {\mathrm{397}}^1$

素因数の和:667

約数の個数: 24

約数和(自身を含む): 37889600

約数和(自身を除く): 16716796

約数列:

[1, 2, 4, 67, 134, 199, 268, 397, 398, 794, 796, 1588, 13333, 26599, 26666, 53198, 53332, 79003, 106396, 158006, 316012, 5293201, 10586402, 21172804]

約数ペア:

[(1, 21172804), (2, 10586402), (4, 5293201), (67, 316012), (134, 158006), (199, 106396), (268, 79003), (397, 53332), (398, 53198), (794, 26666), (796, 26599), (1588, 13333)]