20329031 has 4 divisors (see below), whose sum is σ = 21399000. Its totient is φ = 19259064.

The previous prime is 20329013. The next prime is 20329061. The reversal of 20329031 is 13092302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20329031 is a prime.

It is a super-2 number, since 2×20329031² = 826539002797922, 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 = 20328994 and 20329012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20329061) 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, 534956 + ... + 534993.

It is an arithmetic number, because the mean of its divisors is an integer number (5349750).

Almost surely, 2^20329031 is an apocalyptic number.

20329031 is a deficient number, since it is larger than the sum of its proper divisors (1069969).

20329031 is a wasteful number, since it uses less digits than its factorization.

20329031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069968.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 20329031 is about 4508.7726711379. The cubic root of 20329031 is about 272.9222184006.

The spelling of 20329031 in words is "twenty million, three hundred twenty-nine thousand, thirty-one".