20981775

素因数分解:

$3^1\times 5^2\times {\mathrm{37}}^1\times {\mathrm{7561}}^1$

素因数の和:7611

約数の個数: 24

約数和(自身を含む): 35632144

約数和(自身を除く): 14650369

約数列:

[1, 3, 5, 15, 25, 37, 75, 111, 185, 555, 925, 2775, 7561, 22683, 37805, 113415, 189025, 279757, 567075, 839271, 1398785, 4196355, 6993925, 20981775]

約数ペア:

[(1, 20981775), (3, 6993925), (5, 4196355), (15, 1398785), (25, 839271), (37, 567075), (75, 279757), (111, 189025), (185, 113415), (555, 37805), (925, 22683), (2775, 7561)]