20453778 has 24 divisors (see below), whose sum is σ = 44407116. Its totient is φ = 6804000.

The previous prime is 20453777. The next prime is 20453809. The reversal of 20453778 is 87735402.

It can be written as a sum of positive squares in 2 ways, for example, as 18122049 + 2331729 = 4257^2 + 1527^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20453777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11808 + ... + 13428.

Almost surely, 2^20453778 is an apocalyptic number.

20453778 is an abundant number, since it is smaller than the sum of its proper divisors (23953338).

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

20453778 is a wasteful number, since it uses less digits than its factorization.

20453778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330 (or 2327 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 20453778 is about 4522.5853225782. The cubic root of 20453778 is about 273.4793333960.

The spelling of 20453778 in words is "twenty million, four hundred fifty-three thousand, seven hundred seventy-eight".