21261981

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{79}}^1\times {\mathrm{103}}^1$

素因数の和:265

約数の個数: 32

約数和(自身を含む): 31682560

約数和(自身を除く): 10420579

約数列:

[1, 3, 13, 39, 67, 79, 103, 201, 237, 309, 871, 1027, 1339, 2613, 3081, 4017, 5293, 6901, 8137, 15879, 20703, 24411, 68809, 89713, 105781, 206427, 269139, 317343, 545179, 1635537, 7087327, 21261981]

約数ペア:

[(1, 21261981), (3, 7087327), (13, 1635537), (39, 545179), (67, 317343), (79, 269139), (103, 206427), (201, 105781), (237, 89713), (309, 68809), (871, 24411), (1027, 20703), (1339, 15879), (2613, 8137), (3081, 6901), (4017, 5293)]