20420505

素因数分解:

$3^5\times 5^1\times 7^5$

素因数の和:55

約数の個数: 72

約数和(自身を含む): 42823872

約数和(自身を除く): 22403367

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 49, 63, 81, 105, 135, 147, 189, 243, 245, 315, 343, 405, 441, 567, 735, 945, 1029, 1215, 1323, 1701, 1715, 2205, 2401, 2835, 3087, 3969, 5145, 6615, 7203, 8505, 9261, 11907, 12005, 15435, 16807, 19845, 21609, 27783, 36015, 46305, 50421, 59535, 64827, 83349, 84035, 108045, 138915, 151263, 194481, 252105, 324135, 416745, 453789, 583443, 756315, 972405, 1361367, 2268945, 2917215, 4084101, 6806835, 20420505]

約数ペア:

[(1, 20420505), (3, 6806835), (5, 4084101), (7, 2917215), (9, 2268945), (15, 1361367), (21, 972405), (27, 756315), (35, 583443), (45, 453789), (49, 416745), (63, 324135), (81, 252105), (105, 194481), (135, 151263), (147, 138915), (189, 108045), (243, 84035), (245, 83349), (315, 64827), (343, 59535), (405, 50421), (441, 46305), (567, 36015), (735, 27783), (945, 21609), (1029, 19845), (1215, 16807), (1323, 15435), (1701, 12005), (1715, 11907), (2205, 9261), (2401, 8505), (2835, 7203), (3087, 6615), (3969, 5145)]