21209895

素因数分解:

$3^2\times 5^1\times 7^2\times {\mathrm{9619}}^1$

素因数の和:9644

約数の個数: 36

約数和(自身を含む): 42770520

約数和(自身を除く): 21560625

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 49, 63, 105, 147, 245, 315, 441, 735, 2205, 9619, 28857, 48095, 67333, 86571, 144285, 201999, 336665, 432855, 471331, 605997, 1009995, 1413993, 2356655, 3029985, 4241979, 7069965, 21209895]

約数ペア:

[(1, 21209895), (3, 7069965), (5, 4241979), (7, 3029985), (9, 2356655), (15, 1413993), (21, 1009995), (35, 605997), (45, 471331), (49, 432855), (63, 336665), (105, 201999), (147, 144285), (245, 86571), (315, 67333), (441, 48095), (735, 28857), (2205, 9619)]