20646640

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{23}}^1\times {\mathrm{229}}^1$

素因数の和:279

約数の個数: 120

約数和(自身を含む): 58523040

約数和(自身を除く): 37876400

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 23, 28, 35, 40, 46, 49, 56, 70, 80, 92, 98, 112, 115, 140, 161, 184, 196, 229, 230, 245, 280, 322, 368, 392, 458, 460, 490, 560, 644, 784, 805, 916, 920, 980, 1127, 1145, 1288, 1603, 1610, 1832, 1840, 1960, 2254, 2290, 2576, 3206, 3220, 3664, 3920, 4508, 4580, 5267, 5635, 6412, 6440, 8015, 9016, 9160, 10534, 11221, 11270, 12824, 12880, 16030, 18032, 18320, 21068, 22442, 22540, 25648, 26335, 32060, 36869, 42136, 44884, 45080, 52670, 56105, 64120, 73738, 84272, 89768, 90160, 105340, 112210, 128240, 147476, 179536, 184345, 210680, 224420, 258083, 294952, 368690, 421360, 448840, 516166, 589904, 737380, 897680, 1032332, 1290415, 1474760, 2064664, 2580830, 2949520, 4129328, 5161660, 10323320, 20646640]

約数ペア:

[(1, 20646640), (2, 10323320), (4, 5161660), (5, 4129328), (7, 2949520), (8, 2580830), (10, 2064664), (14, 1474760), (16, 1290415), (20, 1032332), (23, 897680), (28, 737380), (35, 589904), (40, 516166), (46, 448840), (49, 421360), (56, 368690), (70, 294952), (80, 258083), (92, 224420), (98, 210680), (112, 184345), (115, 179536), (140, 147476), (161, 128240), (184, 112210), (196, 105340), (229, 90160), (230, 89768), (245, 84272), (280, 73738), (322, 64120), (368, 56105), (392, 52670), (458, 45080), (460, 44884), (490, 42136), (560, 36869), (644, 32060), (784, 26335), (805, 25648), (916, 22540), (920, 22442), (980, 21068), (1127, 18320), (1145, 18032), (1288, 16030), (1603, 12880), (1610, 12824), (1832, 11270), (1840, 11221), (1960, 10534), (2254, 9160), (2290, 9016), (2576, 8015), (3206, 6440), (3220, 6412), (3664, 5635), (3920, 5267), (4508, 4580)]