18920457 has 6 divisors (see below), whose sum is σ = 27329562. Its totient is φ = 12613632.

The previous prime is 18920453. The next prime is 18920459. The reversal of 18920457 is 75402981.

18920457 is a `hidden beast` number, since 189 + 20 + 457 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18844281 + 76176 = 4341^2 + 276^2 .

It is not a de Polignac number, because 18920457 - 2² = 18920453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18920453) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1051128 + ... + 1051145.

It is an arithmetic number, because the mean of its divisors is an integer number (4554927).

Almost surely, 2^18920457 is an apocalyptic number.

It is an amenable number.

18920457 is a deficient number, since it is larger than the sum of its proper divisors (8409105).

18920457 is a wasteful number, since it uses less digits than its factorization.

18920457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102279 (or 2102276 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 18920457 is about 4349.7651660751. The cubic root of 18920457 is about 266.4672709074.

The spelling of 18920457 in words is "eighteen million, nine hundred twenty thousand, four hundred fifty-seven".