1800000020

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{989011}}^1$

素因数の和:989040

約数の個数: 48

約数和(自身を含む): 4652312448

約数和(自身を除く): 2852312428

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 52, 65, 70, 91, 130, 140, 182, 260, 364, 455, 910, 1820, 989011, 1978022, 3956044, 4945055, 6923077, 9890110, 12857143, 13846154, 19780220, 25714286, 27692308, 34615385, 51428572, 64285715, 69230770, 90000001, 128571430, 138461540, 180000002, 257142860, 360000004, 450000005, 900000010, 1800000020]

約数ペア:

[(1, 1800000020), (2, 900000010), (4, 450000005), (5, 360000004), (7, 257142860), (10, 180000002), (13, 138461540), (14, 128571430), (20, 90000001), (26, 69230770), (28, 64285715), (35, 51428572), (52, 34615385), (65, 27692308), (70, 25714286), (91, 19780220), (130, 13846154), (140, 12857143), (182, 9890110), (260, 6923077), (364, 4945055), (455, 3956044), (910, 1978022), (1820, 989011)]