20197542 has 16 divisors (see below), whose sum is σ = 42151680. Its totient is φ = 6439752.

The previous prime is 20197531. The next prime is 20197549. The reversal of 20197542 is 24579102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20197549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73042 + ... + 73317.

It is an arithmetic number, because the mean of its divisors is an integer number (2634480).

Almost surely, 2^20197542 is an apocalyptic number.

20197542 is an abundant number, since it is smaller than the sum of its proper divisors (21954138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20197542 is a wasteful number, since it uses less digits than its factorization.

20197542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146387.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 20197542 is about 4494.1675536188. The cubic root of 20197542 is about 272.3325211660.

The spelling of 20197542 in words is "twenty million, one hundred ninety-seven thousand, five hundred forty-two".