20739920

素因数分解:

$2^4\times 5^1\times {\mathrm{131}}^1\times {\mathrm{1979}}^1$

素因数の和:2123

約数の個数: 40

約数和(自身を含む): 48612960

約数和(自身を除く): 27873040

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 131, 262, 524, 655, 1048, 1310, 1979, 2096, 2620, 3958, 5240, 7916, 9895, 10480, 15832, 19790, 31664, 39580, 79160, 158320, 259249, 518498, 1036996, 1296245, 2073992, 2592490, 4147984, 5184980, 10369960, 20739920]

約数ペア:

[(1, 20739920), (2, 10369960), (4, 5184980), (5, 4147984), (8, 2592490), (10, 2073992), (16, 1296245), (20, 1036996), (40, 518498), (80, 259249), (131, 158320), (262, 79160), (524, 39580), (655, 31664), (1048, 19790), (1310, 15832), (1979, 10480), (2096, 9895), (2620, 7916), (3958, 5240)]