21878820

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{197}}^1\times {\mathrm{617}}^1$

素因数の和:829

約数の個数: 72

約数和(自身を含む): 66810744

約数和(自身を除く): 44931924

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 197, 394, 591, 617, 788, 985, 1182, 1234, 1773, 1851, 1970, 2364, 2468, 2955, 3085, 3546, 3702, 3940, 5553, 5910, 6170, 7092, 7404, 8865, 9255, 11106, 11820, 12340, 17730, 18510, 22212, 27765, 35460, 37020, 55530, 111060, 121549, 243098, 364647, 486196, 607745, 729294, 1093941, 1215490, 1458588, 1823235, 2187882, 2430980, 3646470, 4375764, 5469705, 7292940, 10939410, 21878820]

約数ペア:

[(1, 21878820), (2, 10939410), (3, 7292940), (4, 5469705), (5, 4375764), (6, 3646470), (9, 2430980), (10, 2187882), (12, 1823235), (15, 1458588), (18, 1215490), (20, 1093941), (30, 729294), (36, 607745), (45, 486196), (60, 364647), (90, 243098), (180, 121549), (197, 111060), (394, 55530), (591, 37020), (617, 35460), (788, 27765), (985, 22212), (1182, 18510), (1234, 17730), (1773, 12340), (1851, 11820), (1970, 11106), (2364, 9255), (2468, 8865), (2955, 7404), (3085, 7092), (3546, 6170), (3702, 5910), (3940, 5553)]