20457087 has 8 divisors (see below), whose sum is σ = 31172736. Its totient is φ = 11689752.

The previous prime is 20457067. The next prime is 20457119. The reversal of 20457087 is 78075402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20457087 - 2⁶ = 20457023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20457037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 487053 + ... + 487094.

It is an arithmetic number, because the mean of its divisors is an integer number (3896592).

Almost surely, 2^20457087 is an apocalyptic number.

20457087 is a deficient number, since it is larger than the sum of its proper divisors (10715649).

20457087 is an equidigital number, since it uses as much as digits as its factorization.

20457087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974157.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 20457087 is about 4522.9511383609. The cubic root of 20457087 is about 273.4940803752.

It can be divided in two parts, 204 and 57087, that added together give a triangular number (57291 = T₃₃₈).

The spelling of 20457087 in words is "twenty million, four hundred fifty-seven thousand, eighty-seven".