20490956 has 6 divisors (see below), whose sum is σ = 35859180. Its totient is φ = 10245476.

The previous prime is 20490947. The next prime is 20490961. The reversal of 20490956 is 65909402.

It is a plaindrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2561366 + ... + 2561373.

It is an arithmetic number, because the mean of its divisors is an integer number (5976530).

Almost surely, 2^20490956 is an apocalyptic number.

It is an amenable number.

20490956 is a deficient number, since it is larger than the sum of its proper divisors (15368224).

20490956 is a wasteful number, since it uses less digits than its factorization.

20490956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5122743 (or 5122741 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 20490956 is about 4526.6937161686. The cubic root of 20490956 is about 273.6449305222.

The spelling of 20490956 in words is "twenty million, four hundred ninety thousand, nine hundred fifty-six".