20981488

素因数分解:

$2^4\times {\mathrm{11}}^1\times {\mathrm{97}}^1\times {\mathrm{1229}}^1$

素因数の和:1345

約数の個数: 40

約数和(自身を含む): 44840880

約数和(自身を除く): 23859392

約数列:

[1, 2, 4, 8, 11, 16, 22, 44, 88, 97, 176, 194, 388, 776, 1067, 1229, 1552, 2134, 2458, 4268, 4916, 8536, 9832, 13519, 17072, 19664, 27038, 54076, 108152, 119213, 216304, 238426, 476852, 953704, 1311343, 1907408, 2622686, 5245372, 10490744, 20981488]

約数ペア:

[(1, 20981488), (2, 10490744), (4, 5245372), (8, 2622686), (11, 1907408), (16, 1311343), (22, 953704), (44, 476852), (88, 238426), (97, 216304), (176, 119213), (194, 108152), (388, 54076), (776, 27038), (1067, 19664), (1229, 17072), (1552, 13519), (2134, 9832), (2458, 8536), (4268, 4916)]