21247965

素因数分解:

$3^2\times 5^1\times {\mathrm{53}}^1\times {\mathrm{59}}^1\times {\mathrm{151}}^1$

素因数の和:274

約数の個数: 48

約数和(自身を含む): 38413440

約数和(自身を除く): 17165475

約数列:

[1, 3, 5, 9, 15, 45, 53, 59, 151, 159, 177, 265, 295, 453, 477, 531, 755, 795, 885, 1359, 2265, 2385, 2655, 3127, 6795, 8003, 8909, 9381, 15635, 24009, 26727, 28143, 40015, 44545, 46905, 72027, 80181, 120045, 133635, 140715, 360135, 400905, 472177, 1416531, 2360885, 4249593, 7082655, 21247965]

約数ペア:

[(1, 21247965), (3, 7082655), (5, 4249593), (9, 2360885), (15, 1416531), (45, 472177), (53, 400905), (59, 360135), (151, 140715), (159, 133635), (177, 120045), (265, 80181), (295, 72027), (453, 46905), (477, 44545), (531, 40015), (755, 28143), (795, 26727), (885, 24009), (1359, 15635), (2265, 9381), (2385, 8909), (2655, 8003), (3127, 6795)]