20787893 has 4 divisors (see below), whose sum is σ = 23757600. Its totient is φ = 17818188.

The previous prime is 20787869. The next prime is 20787901. The reversal of 20787893 is 39878702.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20787893 - 2⁶ = 20787829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20787803) 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, 1484843 + ... + 1484856.

It is an arithmetic number, because the mean of its divisors is an integer number (5939400).

Almost surely, 2^20787893 is an apocalyptic number.

It is an amenable number.

20787893 is a deficient number, since it is larger than the sum of its proper divisors (2969707).

20787893 is an equidigital number, since it uses as much as digits as its factorization.

20787893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2969706.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 20787893 is about 4559.3741895133. The cubic root of 20787893 is about 274.9604042164.

The spelling of 20787893 in words is "twenty million, seven hundred eighty-seven thousand, eight hundred ninety-three".