20948980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{197}}^1\times {\mathrm{409}}^1$

素因数の和:628

約数の個数: 48

約数和(自身を含む): 47733840

約数和(自身を除く): 26784860

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 197, 260, 394, 409, 788, 818, 985, 1636, 1970, 2045, 2561, 3940, 4090, 5122, 5317, 8180, 10244, 10634, 12805, 21268, 25610, 26585, 51220, 53170, 80573, 106340, 161146, 322292, 402865, 805730, 1047449, 1611460, 2094898, 4189796, 5237245, 10474490, 20948980]

約数ペア:

[(1, 20948980), (2, 10474490), (4, 5237245), (5, 4189796), (10, 2094898), (13, 1611460), (20, 1047449), (26, 805730), (52, 402865), (65, 322292), (130, 161146), (197, 106340), (260, 80573), (394, 53170), (409, 51220), (788, 26585), (818, 25610), (985, 21268), (1636, 12805), (1970, 10634), (2045, 10244), (2561, 8180), (3940, 5317), (4090, 5122)]