21064520

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{89}}^1\times {\mathrm{97}}^1$

素因数の和:258

約数の個数: 64

約数和(自身を含む): 49215600

約数和(自身を除く): 28151080

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 89, 97, 122, 178, 194, 244, 305, 356, 388, 445, 485, 488, 610, 712, 776, 890, 970, 1220, 1780, 1940, 2440, 3560, 3880, 5429, 5917, 8633, 10858, 11834, 17266, 21716, 23668, 27145, 29585, 34532, 43165, 43432, 47336, 54290, 59170, 69064, 86330, 108580, 118340, 172660, 217160, 236680, 345320, 526613, 1053226, 2106452, 2633065, 4212904, 5266130, 10532260, 21064520]

約数ペア:

[(1, 21064520), (2, 10532260), (4, 5266130), (5, 4212904), (8, 2633065), (10, 2106452), (20, 1053226), (40, 526613), (61, 345320), (89, 236680), (97, 217160), (122, 172660), (178, 118340), (194, 108580), (244, 86330), (305, 69064), (356, 59170), (388, 54290), (445, 47336), (485, 43432), (488, 43165), (610, 34532), (712, 29585), (776, 27145), (890, 23668), (970, 21716), (1220, 17266), (1780, 11834), (1940, 10858), (2440, 8633), (3560, 5917), (3880, 5429)]