21381520

素因数分解:

$2^4\times 5^1\times {\mathrm{241}}^1\times {\mathrm{1109}}^1$

素因数の和:1363

約数の個数: 40

約数和(自身を含む): 49963320

約数和(自身を除く): 28581800

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 241, 482, 964, 1109, 1205, 1928, 2218, 2410, 3856, 4436, 4820, 5545, 8872, 9640, 11090, 17744, 19280, 22180, 44360, 88720, 267269, 534538, 1069076, 1336345, 2138152, 2672690, 4276304, 5345380, 10690760, 21381520]

約数ペア:

[(1, 21381520), (2, 10690760), (4, 5345380), (5, 4276304), (8, 2672690), (10, 2138152), (16, 1336345), (20, 1069076), (40, 534538), (80, 267269), (241, 88720), (482, 44360), (964, 22180), (1109, 19280), (1205, 17744), (1928, 11090), (2218, 9640), (2410, 8872), (3856, 5545), (4436, 4820)]