21195860

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{101}}^1\times {\mathrm{1499}}^1$

素因数の和:1616

約数の個数: 48

約数和(自身を含む): 51408000

約数和(自身を除く): 30212140

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 101, 140, 202, 404, 505, 707, 1010, 1414, 1499, 2020, 2828, 2998, 3535, 5996, 7070, 7495, 10493, 14140, 14990, 20986, 29980, 41972, 52465, 104930, 151399, 209860, 302798, 605596, 756995, 1059793, 1513990, 2119586, 3027980, 4239172, 5298965, 10597930, 21195860]

約数ペア:

[(1, 21195860), (2, 10597930), (4, 5298965), (5, 4239172), (7, 3027980), (10, 2119586), (14, 1513990), (20, 1059793), (28, 756995), (35, 605596), (70, 302798), (101, 209860), (140, 151399), (202, 104930), (404, 52465), (505, 41972), (707, 29980), (1010, 20986), (1414, 14990), (1499, 14140), (2020, 10493), (2828, 7495), (2998, 7070), (3535, 5996)]