20981772

素因数分解:

$2^2\times 3^2\times 7^1\times {\mathrm{139}}^1\times {\mathrm{599}}^1$

素因数の和:755

約数の個数: 72

約数和(自身を含む): 61152000

約数和(自身を除く): 40170228

約数列:

[1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 139, 252, 278, 417, 556, 599, 834, 973, 1198, 1251, 1668, 1797, 1946, 2396, 2502, 2919, 3594, 3892, 4193, 5004, 5391, 5838, 7188, 8386, 8757, 10782, 11676, 12579, 16772, 17514, 21564, 25158, 35028, 37737, 50316, 75474, 83261, 150948, 166522, 249783, 333044, 499566, 582827, 749349, 999132, 1165654, 1498698, 1748481, 2331308, 2997396, 3496962, 5245443, 6993924, 10490886, 20981772]

約数ペア:

[(1, 20981772), (2, 10490886), (3, 6993924), (4, 5245443), (6, 3496962), (7, 2997396), (9, 2331308), (12, 1748481), (14, 1498698), (18, 1165654), (21, 999132), (28, 749349), (36, 582827), (42, 499566), (63, 333044), (84, 249783), (126, 166522), (139, 150948), (252, 83261), (278, 75474), (417, 50316), (556, 37737), (599, 35028), (834, 25158), (973, 21564), (1198, 17514), (1251, 16772), (1668, 12579), (1797, 11676), (1946, 10782), (2396, 8757), (2502, 8386), (2919, 7188), (3594, 5838), (3892, 5391), (4193, 5004)]