20138542 has 8 divisors (see below), whose sum is σ = 30411000. Its totient is φ = 10001544.

The previous prime is 20138533. The next prime is 20138567. The reversal of 20138542 is 24583102.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33492 + ... + 34087.

It is an arithmetic number, because the mean of its divisors is an integer number (3801375).

Almost surely, 2^20138542 is an apocalyptic number.

20138542 is a deficient number, since it is larger than the sum of its proper divisors (10272458).

20138542 is a wasteful number, since it uses less digits than its factorization.

20138542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67730.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20138542 is about 4487.5986897226. The cubic root of 20138542 is about 272.0670880507.

The spelling of 20138542 in words is "twenty million, one hundred thirty-eight thousand, five hundred forty-two".