20906456 has 16 divisors (see below), whose sum is σ = 39641400. Its totient is φ = 10335424.

The previous prime is 20906453. The next prime is 20906461. The reversal of 20906456 is 65460902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20906453) 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, 13970 + ... + 15393.

Almost surely, 2^20906456 is an apocalyptic number.

It is an amenable number.

20906456 is a deficient number, since it is larger than the sum of its proper divisors (18734944).

20906456 is a wasteful number, since it uses less digits than its factorization.

20906456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29458 (or 29454 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 20906456 is about 4572.3578162694. The cubic root of 20906456 is about 275.4821557981.

The spelling of 20906456 in words is "twenty million, nine hundred six thousand, four hundred fifty-six".