21739640

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{97}}^1\times {\mathrm{431}}^1$

素因数の和:552

約数の個数: 64

約数和(自身を含む): 53343360

約数和(自身を除く): 31603720

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 97, 104, 130, 194, 260, 388, 431, 485, 520, 776, 862, 970, 1261, 1724, 1940, 2155, 2522, 3448, 3880, 4310, 5044, 5603, 6305, 8620, 10088, 11206, 12610, 17240, 22412, 25220, 28015, 41807, 44824, 50440, 56030, 83614, 112060, 167228, 209035, 224120, 334456, 418070, 543491, 836140, 1086982, 1672280, 2173964, 2717455, 4347928, 5434910, 10869820, 21739640]

約数ペア:

[(1, 21739640), (2, 10869820), (4, 5434910), (5, 4347928), (8, 2717455), (10, 2173964), (13, 1672280), (20, 1086982), (26, 836140), (40, 543491), (52, 418070), (65, 334456), (97, 224120), (104, 209035), (130, 167228), (194, 112060), (260, 83614), (388, 56030), (431, 50440), (485, 44824), (520, 41807), (776, 28015), (862, 25220), (970, 22412), (1261, 17240), (1724, 12610), (1940, 11206), (2155, 10088), (2522, 8620), (3448, 6305), (3880, 5603), (4310, 5044)]