21125920

素因数分解:

$2^5\times 5^1\times {\mathrm{29}}^2\times {\mathrm{157}}^1$

素因数の和:230

約数の個数: 72

約数和(自身を含む): 52019604

約数和(自身を除く): 30893684

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 29, 32, 40, 58, 80, 116, 145, 157, 160, 232, 290, 314, 464, 580, 628, 785, 841, 928, 1160, 1256, 1570, 1682, 2320, 2512, 3140, 3364, 4205, 4553, 4640, 5024, 6280, 6728, 8410, 9106, 12560, 13456, 16820, 18212, 22765, 25120, 26912, 33640, 36424, 45530, 67280, 72848, 91060, 132037, 134560, 145696, 182120, 264074, 364240, 528148, 660185, 728480, 1056296, 1320370, 2112592, 2640740, 4225184, 5281480, 10562960, 21125920]

約数ペア:

[(1, 21125920), (2, 10562960), (4, 5281480), (5, 4225184), (8, 2640740), (10, 2112592), (16, 1320370), (20, 1056296), (29, 728480), (32, 660185), (40, 528148), (58, 364240), (80, 264074), (116, 182120), (145, 145696), (157, 134560), (160, 132037), (232, 91060), (290, 72848), (314, 67280), (464, 45530), (580, 36424), (628, 33640), (785, 26912), (841, 25120), (928, 22765), (1160, 18212), (1256, 16820), (1570, 13456), (1682, 12560), (2320, 9106), (2512, 8410), (3140, 6728), (3364, 6280), (4205, 5024), (4553, 4640)]