20631946 has 16 divisors (see below), whose sum is σ = 32076000. Its totient is φ = 9946768.

The previous prime is 20631937. The next prime is 20631953. The reversal of 20631946 is 64913602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4605 + ... + 7903.

It is an arithmetic number, because the mean of its divisors is an integer number (2004750).

Almost surely, 2^20631946 is an apocalyptic number.

20631946 is a deficient number, since it is larger than the sum of its proper divisors (11444054).

20631946 is a wasteful number, since it uses less digits than its factorization.

20631946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3413.

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

The square root of 20631946 is about 4542.2401962028. The cubic root of 20631946 is about 274.2711099977.

The spelling of 20631946 in words is "twenty million, six hundred thirty-one thousand, nine hundred forty-six".