21836780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{2557}}^1$

素因数の和:2634

約数の個数: 48

約数和(自身を含む): 53288256

約数和(自身を除く): 31451476

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 61, 70, 122, 140, 244, 305, 427, 610, 854, 1220, 1708, 2135, 2557, 4270, 5114, 8540, 10228, 12785, 17899, 25570, 35798, 51140, 71596, 89495, 155977, 178990, 311954, 357980, 623908, 779885, 1091839, 1559770, 2183678, 3119540, 4367356, 5459195, 10918390, 21836780]

約数ペア:

[(1, 21836780), (2, 10918390), (4, 5459195), (5, 4367356), (7, 3119540), (10, 2183678), (14, 1559770), (20, 1091839), (28, 779885), (35, 623908), (61, 357980), (70, 311954), (122, 178990), (140, 155977), (244, 89495), (305, 71596), (427, 51140), (610, 35798), (854, 25570), (1220, 17899), (1708, 12785), (2135, 10228), (2557, 8540), (4270, 5114)]