20631964 has 6 divisors (see below), whose sum is σ = 36105944. Its totient is φ = 10315980.

The previous prime is 20631953. The next prime is 20631971. The reversal of 20631964 is 46913602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2578992 + ... + 2578999.

Almost surely, 2^20631964 is an apocalyptic number.

It is an amenable number.

20631964 is a deficient number, since it is larger than the sum of its proper divisors (15473980).

20631964 is a wasteful number, since it uses less digits than its factorization.

20631964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5157995 (or 5157993 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20631964 is about 4542.2421776035. The cubic root of 20631964 is about 274.2711897587.

The spelling of 20631964 in words is "twenty million, six hundred thirty-one thousand, nine hundred sixty-four".