20545456 has 20 divisors (see below), whose sum is σ = 41180400. Its totient is φ = 9918272.

The previous prime is 20545433. The next prime is 20545477. The reversal of 20545456 is 65454502.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21676 + ... + 22603.

It is an arithmetic number, because the mean of its divisors is an integer number (2059020).

Almost surely, 2^20545456 is an apocalyptic number.

It is an amenable number.

20545456 is an abundant number, since it is smaller than the sum of its proper divisors (20634944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20545456 is a wasteful number, since it uses less digits than its factorization.

20545456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44316 (or 44310 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 20545456 is about 4532.7095649291. The cubic root of 20545456 is about 273.8873211363.

Adding to 20545456 its reverse (65454502), we get a palindrome (85999958).

The spelling of 20545456 in words is "twenty million, five hundred forty-five thousand, four hundred fifty-six".