21357775

素因数分解:

$5^2\times {\mathrm{29}}^1\times {\mathrm{89}}^1\times {\mathrm{331}}^1$

素因数の和:459

約数の個数: 24

約数和(自身を含む): 27788400

約数和(自身を除く): 6430625

約数列:

[1, 5, 25, 29, 89, 145, 331, 445, 725, 1655, 2225, 2581, 8275, 9599, 12905, 29459, 47995, 64525, 147295, 239975, 736475, 854311, 4271555, 21357775]

約数ペア:

[(1, 21357775), (5, 4271555), (25, 854311), (29, 736475), (89, 239975), (145, 147295), (331, 64525), (445, 47995), (725, 29459), (1655, 12905), (2225, 9599), (2581, 8275)]