21405636

素因数分解:

$2^2\times 3^2\times 7^1\times {\mathrm{173}}^1\times {\mathrm{491}}^1$

素因数の和:681

約数の個数: 72

約数和(自身を含む): 62322624

約数和(自身を除く): 40916988

約数列:

[1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 173, 252, 346, 491, 519, 692, 982, 1038, 1211, 1473, 1557, 1964, 2076, 2422, 2946, 3114, 3437, 3633, 4419, 4844, 5892, 6228, 6874, 7266, 8838, 10311, 10899, 13748, 14532, 17676, 20622, 21798, 30933, 41244, 43596, 61866, 84943, 123732, 169886, 254829, 339772, 509658, 594601, 764487, 1019316, 1189202, 1528974, 1783803, 2378404, 3057948, 3567606, 5351409, 7135212, 10702818, 21405636]

約数ペア:

[(1, 21405636), (2, 10702818), (3, 7135212), (4, 5351409), (6, 3567606), (7, 3057948), (9, 2378404), (12, 1783803), (14, 1528974), (18, 1189202), (21, 1019316), (28, 764487), (36, 594601), (42, 509658), (63, 339772), (84, 254829), (126, 169886), (173, 123732), (252, 84943), (346, 61866), (491, 43596), (519, 41244), (692, 30933), (982, 21798), (1038, 20622), (1211, 17676), (1473, 14532), (1557, 13748), (1964, 10899), (2076, 10311), (2422, 8838), (2946, 7266), (3114, 6874), (3437, 6228), (3633, 5892), (4419, 4844)]