21656988

素因数分解:

$2^2\times 3^2\times {\mathrm{37}}^1\times {\mathrm{71}}^1\times {\mathrm{229}}^1$

素因数の和:347

約数の個数: 72

約数和(自身を含む): 57264480

約数和(自身を除く): 35607492

約数列:

[1, 2, 3, 4, 6, 9, 12, 18, 36, 37, 71, 74, 111, 142, 148, 213, 222, 229, 284, 333, 426, 444, 458, 639, 666, 687, 852, 916, 1278, 1332, 1374, 2061, 2556, 2627, 2748, 4122, 5254, 7881, 8244, 8473, 10508, 15762, 16259, 16946, 23643, 25419, 31524, 32518, 33892, 47286, 48777, 50838, 65036, 76257, 94572, 97554, 101676, 146331, 152514, 195108, 292662, 305028, 585324, 601583, 1203166, 1804749, 2406332, 3609498, 5414247, 7218996, 10828494, 21656988]

約数ペア:

[(1, 21656988), (2, 10828494), (3, 7218996), (4, 5414247), (6, 3609498), (9, 2406332), (12, 1804749), (18, 1203166), (36, 601583), (37, 585324), (71, 305028), (74, 292662), (111, 195108), (142, 152514), (148, 146331), (213, 101676), (222, 97554), (229, 94572), (284, 76257), (333, 65036), (426, 50838), (444, 48777), (458, 47286), (639, 33892), (666, 32518), (687, 31524), (852, 25419), (916, 23643), (1278, 16946), (1332, 16259), (1374, 15762), (2061, 10508), (2556, 8473), (2627, 8244), (2748, 7881), (4122, 5254)]