19661980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{1609}}^1$

素因数の和:1678

約数の個数: 48

約数和(自身を含む): 45440640

約数和(自身を除く): 25778660

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 47, 52, 65, 94, 130, 188, 235, 260, 470, 611, 940, 1222, 1609, 2444, 3055, 3218, 6110, 6436, 8045, 12220, 16090, 20917, 32180, 41834, 75623, 83668, 104585, 151246, 209170, 302492, 378115, 418340, 756230, 983099, 1512460, 1966198, 3932396, 4915495, 9830990, 19661980]

約数ペア:

[(1, 19661980), (2, 9830990), (4, 4915495), (5, 3932396), (10, 1966198), (13, 1512460), (20, 983099), (26, 756230), (47, 418340), (52, 378115), (65, 302492), (94, 209170), (130, 151246), (188, 104585), (235, 83668), (260, 75623), (470, 41834), (611, 32180), (940, 20917), (1222, 16090), (1609, 12220), (2444, 8045), (3055, 6436), (3218, 6110)]