20781994220

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^3\times {\mathrm{472963}}^1$

素因数の和:473011

約数の個数: 48

約数和(自身を含む): 47277481440

約数和(自身を除く): 26495487220

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 169, 260, 338, 676, 845, 1690, 2197, 3380, 4394, 8788, 10985, 21970, 43940, 472963, 945926, 1891852, 2364815, 4729630, 6148519, 9459260, 12297038, 24594076, 30742595, 61485190, 79930747, 122970380, 159861494, 319722988, 399653735, 799307470, 1039099711, 1598614940, 2078199422, 4156398844, 5195498555, 10390997110, 20781994220]

約数ペア:

[(1, 20781994220), (2, 10390997110), (4, 5195498555), (5, 4156398844), (10, 2078199422), (13, 1598614940), (20, 1039099711), (26, 799307470), (52, 399653735), (65, 319722988), (130, 159861494), (169, 122970380), (260, 79930747), (338, 61485190), (676, 30742595), (845, 24594076), (1690, 12297038), (2197, 9459260), (3380, 6148519), (4394, 4729630), (8788, 2364815), (10985, 1891852), (21970, 945926), (43940, 472963)]