20157542 has 8 divisors (see below), whose sum is σ = 30324000. Its totient is φ = 10049544.

The previous prime is 20157517. The next prime is 20157551. The reversal of 20157542 is 24575102.

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, 13742 + ... + 15137.

It is an arithmetic number, because the mean of its divisors is an integer number (3790500).

Almost surely, 2^20157542 is an apocalyptic number.

20157542 is a deficient number, since it is larger than the sum of its proper divisors (10166458).

20157542 is a wasteful number, since it uses less digits than its factorization.

20157542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29230.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 20157542 is about 4489.7151357297. The cubic root of 20157542 is about 272.1526230388.

The spelling of 20157542 in words is "twenty million, one hundred fifty-seven thousand, five hundred forty-two".