20539438 has 4 divisors (see below), whose sum is σ = 30809160. Its totient is φ = 10269718.

The previous prime is 20539433. The next prime is 20539481. The reversal of 20539438 is 83493502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20539433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5134858 + ... + 5134861.

It is an arithmetic number, because the mean of its divisors is an integer number (7702290).

Almost surely, 2^20539438 is an apocalyptic number.

20539438 is a deficient number, since it is larger than the sum of its proper divisors (10269722).

20539438 is a wasteful number, since it uses less digits than its factorization.

20539438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10269721.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 20539438 is about 4532.0456749684. The cubic root of 20539438 is about 273.8605769444.

The spelling of 20539438 in words is "twenty million, five hundred thirty-nine thousand, four hundred thirty-eight".