20945837 has 4 divisors (see below), whose sum is σ = 22850016. Its totient is φ = 19041660.

The previous prime is 20945833. The next prime is 20945843. The reversal of 20945837 is 73854902.

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 not a de Polignac number, because 20945837 - 2² = 20945833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20945837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20945833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 952073 + ... + 952094.

It is an arithmetic number, because the mean of its divisors is an integer number (5712504).

Almost surely, 2^20945837 is an apocalyptic number.

It is an amenable number.

20945837 is a deficient number, since it is larger than the sum of its proper divisors (1904179).

20945837 is a wasteful number, since it uses less digits than its factorization.

20945837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904178.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 20945837 is about 4576.6622116997. The cubic root of 20945837 is about 275.6550203914.

The spelling of 20945837 in words is "twenty million, nine hundred forty-five thousand, eight hundred thirty-seven".