20540457

素因数分解:

$3^2\times 7^2\times {\mathrm{47}}^1\times {\mathrm{991}}^1$

素因数の和:1058

約数の個数: 36

約数和(自身を含む): 35283456

約数和(自身を除く): 14742999

約数列:

[1, 3, 7, 9, 21, 47, 49, 63, 141, 147, 329, 423, 441, 987, 991, 2303, 2961, 2973, 6909, 6937, 8919, 20727, 20811, 46577, 48559, 62433, 139731, 145677, 326039, 419193, 437031, 978117, 2282273, 2934351, 6846819, 20540457]

約数ペア:

[(1, 20540457), (3, 6846819), (7, 2934351), (9, 2282273), (21, 978117), (47, 437031), (49, 419193), (63, 326039), (141, 145677), (147, 139731), (329, 62433), (423, 48559), (441, 46577), (987, 20811), (991, 20727), (2303, 8919), (2961, 6937), (2973, 6909)]