21005972

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{83}}^1\times {\mathrm{157}}^1$

素因数の和:288

約数の個数: 48

約数和(自身を含む): 41620992

約数和(自身を除く): 20615020

約数列:

[1, 2, 4, 13, 26, 31, 52, 62, 83, 124, 157, 166, 314, 332, 403, 628, 806, 1079, 1612, 2041, 2158, 2573, 4082, 4316, 4867, 5146, 8164, 9734, 10292, 13031, 19468, 26062, 33449, 52124, 63271, 66898, 126542, 133796, 169403, 253084, 338806, 403961, 677612, 807922, 1615844, 5251493, 10502986, 21005972]

約数ペア:

[(1, 21005972), (2, 10502986), (4, 5251493), (13, 1615844), (26, 807922), (31, 677612), (52, 403961), (62, 338806), (83, 253084), (124, 169403), (157, 133796), (166, 126542), (314, 66898), (332, 63271), (403, 52124), (628, 33449), (806, 26062), (1079, 19468), (1612, 13031), (2041, 10292), (2158, 9734), (2573, 8164), (4082, 5146), (4316, 4867)]