20164042 has 4 divisors (see below), whose sum is σ = 30246066. Its totient is φ = 10082020.

The previous prime is 20164013. The next prime is 20164049. The reversal of 20164042 is 24046102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24046102 = 2 ⋅12023051.

It can be written as a sum of positive squares in only one way, i.e., 20079361 + 84681 = 4481^2 + 291^2 .

It is not an unprimeable number, because it can be changed into a prime (20164049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5041009 + ... + 5041012.

Almost surely, 2^20164042 is an apocalyptic number.

20164042 is a deficient number, since it is larger than the sum of its proper divisors (10082024).

20164042 is a wasteful number, since it uses less digits than its factorization.

20164042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10082023.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20164042 is about 4490.4389540445. The cubic root of 20164042 is about 272.1818726689.

The spelling of 20164042 in words is "twenty million, one hundred sixty-four thousand, forty-two".