20439494 has 4 divisors (see below), whose sum is σ = 30659244. Its totient is φ = 10219746.

The previous prime is 20439493. The next prime is 20439541. The reversal of 20439494 is 49493402.

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 (20439493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5109872 + ... + 5109875.

It is an arithmetic number, because the mean of its divisors is an integer number (7664811).

Almost surely, 2^20439494 is an apocalyptic number.

20439494 is a deficient number, since it is larger than the sum of its proper divisors (10219750).

20439494 is a wasteful number, since it uses less digits than its factorization.

20439494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10219749.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 20439494 is about 4521.0058615313. The cubic root of 20439494 is about 273.4156566758.

The spelling of 20439494 in words is "twenty million, four hundred thirty-nine thousand, four hundred ninety-four".