19720935

素因数分解:

$3^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{661}}^1$

素因数の和:705

約数の個数: 64

約数和(自身を含む): 40037760

約数和(自身を除く): 20316825

約数列:

[1, 3, 5, 9, 13, 15, 17, 27, 39, 45, 51, 65, 85, 117, 135, 153, 195, 221, 255, 351, 459, 585, 661, 663, 765, 1105, 1755, 1983, 1989, 2295, 3305, 3315, 5949, 5967, 8593, 9915, 9945, 11237, 17847, 25779, 29745, 29835, 33711, 42965, 56185, 77337, 89235, 101133, 128895, 146081, 168555, 232011, 303399, 386685, 438243, 505665, 730405, 1160055, 1314729, 1516995, 2191215, 3944187, 6573645, 19720935]

約数ペア:

[(1, 19720935), (3, 6573645), (5, 3944187), (9, 2191215), (13, 1516995), (15, 1314729), (17, 1160055), (27, 730405), (39, 505665), (45, 438243), (51, 386685), (65, 303399), (85, 232011), (117, 168555), (135, 146081), (153, 128895), (195, 101133), (221, 89235), (255, 77337), (351, 56185), (459, 42965), (585, 33711), (661, 29835), (663, 29745), (765, 25779), (1105, 17847), (1755, 11237), (1983, 9945), (1989, 9915), (2295, 8593), (3305, 5967), (3315, 5949)]