20331956 has 12 divisors (see below), whose sum is σ = 35626080. Its totient is φ = 10153080.

The previous prime is 20331953. The next prime is 20331967. The reversal of 20331956 is 65913302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331953) 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, 911 + ... + 6441.

It is an arithmetic number, because the mean of its divisors is an integer number (2968840).

Almost surely, 2^20331956 is an apocalyptic number.

It is an amenable number.

20331956 is a deficient number, since it is larger than the sum of its proper divisors (15294124).

20331956 is a wasteful number, since it uses less digits than its factorization.

20331956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6454 (or 6452 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 20331956 is about 4509.0970271219. The cubic root of 20331956 is about 272.9353073866.

The spelling of 20331956 in words is "twenty million, three hundred thirty-one thousand, nine hundred fifty-six".