20390534 has 8 divisors (see below), whose sum is σ = 32195640. Its totient is φ = 9658656.

The previous prime is 20390483. The next prime is 20390549. The reversal of 20390534 is 43509302.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268259 + ... + 268334.

It is an arithmetic number, because the mean of its divisors is an integer number (4024455).

Almost surely, 2^20390534 is an apocalyptic number.

20390534 is a deficient number, since it is larger than the sum of its proper divisors (11805106).

20390534 is a wasteful number, since it uses less digits than its factorization.

20390534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536614.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 20390534 is about 4515.5878908510. The cubic root of 20390534 is about 273.1971722513.

Adding to 20390534 its reverse (43509302), we get a palindrome (63899836).

The spelling of 20390534 in words is "twenty million, three hundred ninety thousand, five hundred thirty-four".