21044968

素因数分解:

$2^3\times 7^1\times {\mathrm{67}}^1\times {\mathrm{71}}^1\times {\mathrm{79}}^1$

素因数の和:230

約数の個数: 64

約数和(自身を含む): 47001600

約数和(自身を除く): 25956632

約数列:

[1, 2, 4, 7, 8, 14, 28, 56, 67, 71, 79, 134, 142, 158, 268, 284, 316, 469, 497, 536, 553, 568, 632, 938, 994, 1106, 1876, 1988, 2212, 3752, 3976, 4424, 4757, 5293, 5609, 9514, 10586, 11218, 19028, 21172, 22436, 33299, 37051, 38056, 39263, 42344, 44872, 66598, 74102, 78526, 133196, 148204, 157052, 266392, 296408, 314104, 375803, 751606, 1503212, 2630621, 3006424, 5261242, 10522484, 21044968]

約数ペア:

[(1, 21044968), (2, 10522484), (4, 5261242), (7, 3006424), (8, 2630621), (14, 1503212), (28, 751606), (56, 375803), (67, 314104), (71, 296408), (79, 266392), (134, 157052), (142, 148204), (158, 133196), (268, 78526), (284, 74102), (316, 66598), (469, 44872), (497, 42344), (536, 39263), (553, 38056), (568, 37051), (632, 33299), (938, 22436), (994, 21172), (1106, 19028), (1876, 11218), (1988, 10586), (2212, 9514), (3752, 5609), (3976, 5293), (4424, 4757)]