20706929 has 2 divisors, whose sum is σ = 20706930. Its totient is φ = 20706928.

The previous prime is 20706871. The next prime is 20706947. The reversal of 20706929 is 92960702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18879025 + 1827904 = 4345^2 + 1352^2 .

It is a cyclic number.

It is not a de Polignac number, because 20706929 - 2¹² = 20702833 is a prime.

It is a super-2 number, since 2×20706929² = 857553817222082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20700929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10353464 + 10353465.

It is an arithmetic number, because the mean of its divisors is an integer number (10353465).

Almost surely, 2^20706929 is an apocalyptic number.

It is an amenable number.

20706929 is a deficient number, since it is larger than the sum of its proper divisors (1).

20706929 is an equidigital number, since it uses as much as digits as its factorization.

20706929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 20706929 is about 4550.4866772687. The cubic root of 20706929 is about 274.6029708698.

The spelling of 20706929 in words is "twenty million, seven hundred six thousand, nine hundred twenty-nine".