20806640

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{15299}}^1$

素因数の和:15329

約数の個数: 40

約数和(自身を含む): 51224400

約数和(自身を除く): 30417760

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 15299, 30598, 61196, 76495, 122392, 152990, 244784, 260083, 305980, 520166, 611960, 1040332, 1223920, 1300415, 2080664, 2600830, 4161328, 5201660, 10403320, 20806640]

約数ペア:

[(1, 20806640), (2, 10403320), (4, 5201660), (5, 4161328), (8, 2600830), (10, 2080664), (16, 1300415), (17, 1223920), (20, 1040332), (34, 611960), (40, 520166), (68, 305980), (80, 260083), (85, 244784), (136, 152990), (170, 122392), (272, 76495), (340, 61196), (680, 30598), (1360, 15299)]