21396564

素因数分解:

$2^2\times 3^2\times 7^1\times {\mathrm{197}}^1\times {\mathrm{431}}^1$

素因数の和:645

約数の個数: 72

約数和(自身を含む): 62270208

約数和(自身を除く): 40873644

約数列:

[1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 197, 252, 394, 431, 591, 788, 862, 1182, 1293, 1379, 1724, 1773, 2364, 2586, 2758, 3017, 3546, 3879, 4137, 5172, 5516, 6034, 7092, 7758, 8274, 9051, 12068, 12411, 15516, 16548, 18102, 24822, 27153, 36204, 49644, 54306, 84907, 108612, 169814, 254721, 339628, 509442, 594349, 764163, 1018884, 1188698, 1528326, 1783047, 2377396, 3056652, 3566094, 5349141, 7132188, 10698282, 21396564]

約数ペア:

[(1, 21396564), (2, 10698282), (3, 7132188), (4, 5349141), (6, 3566094), (7, 3056652), (9, 2377396), (12, 1783047), (14, 1528326), (18, 1188698), (21, 1018884), (28, 764163), (36, 594349), (42, 509442), (63, 339628), (84, 254721), (126, 169814), (197, 108612), (252, 84907), (394, 54306), (431, 49644), (591, 36204), (788, 27153), (862, 24822), (1182, 18102), (1293, 16548), (1379, 15516), (1724, 12411), (1773, 12068), (2364, 9051), (2586, 8274), (2758, 7758), (3017, 7092), (3546, 6034), (3879, 5516), (4137, 5172)]