21291885

素因数分解:

$3^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{15263}}^1$

素因数の和:15305

約数の個数: 24

約数和(自身を含む): 38098944

約数和(自身を除く): 16807059

約数列:

[1, 3, 5, 9, 15, 31, 45, 93, 155, 279, 465, 1395, 15263, 45789, 76315, 137367, 228945, 473153, 686835, 1419459, 2365765, 4258377, 7097295, 21291885]

約数ペア:

[(1, 21291885), (3, 7097295), (5, 4258377), (9, 2365765), (15, 1419459), (31, 686835), (45, 473153), (93, 228945), (155, 137367), (279, 76315), (465, 45789), (1395, 15263)]