81178780

素因数分解:

$2^2\times 5^1\times {\mathrm{139}}^1\times {\mathrm{29201}}^1$

素因数の和:29349

約数の個数: 24

約数和(自身を含む): 171707760

約数和(自身を除く): 90528980

約数列:

[1, 2, 4, 5, 10, 20, 139, 278, 556, 695, 1390, 2780, 29201, 58402, 116804, 146005, 292010, 584020, 4058939, 8117878, 16235756, 20294695, 40589390, 81178780]

約数ペア:

[(1, 81178780), (2, 40589390), (4, 20294695), (5, 16235756), (10, 8117878), (20, 4058939), (139, 584020), (278, 292010), (556, 146005), (695, 116804), (1390, 58402), (2780, 29201)]