20669031 has 24 divisors (see below), whose sum is σ = 30635904. Its totient is φ = 13424400.

The previous prime is 20669027. The next prime is 20669039. The reversal of 20669031 is 13096602.

It is a happy number.

It is not a de Polignac number, because 20669031 - 2² = 20669027 is a prime.

It is a super-2 number, since 2×20669031² = 854417684957922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20668986 and 20669004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20669039) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90940 + ... + 91166.

It is an arithmetic number, because the mean of its divisors is an integer number (1276496).

Almost surely, 2^20669031 is an apocalyptic number.

20669031 is a deficient number, since it is larger than the sum of its proper divisors (9966873).

20669031 is a wasteful number, since it uses less digits than its factorization.

20669031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451 (or 448 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 20669031 is about 4546.3206002217. The cubic root of 20669031 is about 274.4353416543.

The spelling of 20669031 in words is "twenty million, six hundred sixty-nine thousand, thirty-one".