20790031 has 4 divisors (see below), whose sum is σ = 22012992. Its totient is φ = 19567072.

The previous prime is 20790023. The next prime is 20790043. The reversal of 20790031 is 13009702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20790031 - 2³ = 20790023 is a prime.

It is a super-2 number, since 2×20790031² = 864450777961922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20789984 and 20790011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20790431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 611455 + ... + 611488.

It is an arithmetic number, because the mean of its divisors is an integer number (5503248).

Almost surely, 2^20790031 is an apocalyptic number.

20790031 is a deficient number, since it is larger than the sum of its proper divisors (1222961).

20790031 is a wasteful number, since it uses less digits than its factorization.

20790031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222960.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 20790031 is about 4559.6086454870. The cubic root of 20790031 is about 274.9698302991.

Adding to 20790031 its reverse (13009702), we get a palindrome (33799733).

The spelling of 20790031 in words is "twenty million, seven hundred ninety thousand, thirty-one".