20639342 has 4 divisors (see below), whose sum is σ = 30959016. Its totient is φ = 10319670.

The previous prime is 20639341. The next prime is 20639347. The reversal of 20639342 is 24393602.

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 (20639341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5159834 + ... + 5159837.

It is an arithmetic number, because the mean of its divisors is an integer number (7739754).

Almost surely, 2^20639342 is an apocalyptic number.

20639342 is a deficient number, since it is larger than the sum of its proper divisors (10319674).

20639342 is a wasteful number, since it uses less digits than its factorization.

20639342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10319673.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 20639342 is about 4543.0542589760. The cubic root of 20639342 is about 274.3038790312.

The spelling of 20639342 in words is "twenty million, six hundred thirty-nine thousand, three hundred forty-two".