19939521

素因数分解:

$3^1\times 7^2\times {\mathrm{17}}^1\times {\mathrm{79}}^1\times {\mathrm{101}}^1$

素因数の和:214

約数の個数: 48

約数和(自身を含む): 33488640

約数和(自身を除く): 13549119

約数列:

[1, 3, 7, 17, 21, 49, 51, 79, 101, 119, 147, 237, 303, 357, 553, 707, 833, 1343, 1659, 1717, 2121, 2499, 3871, 4029, 4949, 5151, 7979, 9401, 11613, 12019, 14847, 23937, 28203, 36057, 55853, 65807, 84133, 135643, 167559, 197421, 252399, 390971, 406929, 949501, 1172913, 2848503, 6646507, 19939521]

約数ペア:

[(1, 19939521), (3, 6646507), (7, 2848503), (17, 1172913), (21, 949501), (49, 406929), (51, 390971), (79, 252399), (101, 197421), (119, 167559), (147, 135643), (237, 84133), (303, 65807), (357, 55853), (553, 36057), (707, 28203), (833, 23937), (1343, 14847), (1659, 12019), (1717, 11613), (2121, 9401), (2499, 7979), (3871, 5151), (4029, 4949)]