20102042 has 4 divisors (see below), whose sum is σ = 30153066. Its totient is φ = 10051020.

The previous prime is 20102029. The next prime is 20102087. The reversal of 20102042 is 24020102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13756681 + 6345361 = 3709^2 + 2519^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5025509 + ... + 5025512.

Almost surely, 2^20102042 is an apocalyptic number.

20102042 is a deficient number, since it is larger than the sum of its proper divisors (10051024).

20102042 is a wasteful number, since it uses less digits than its factorization.

20102042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10051023.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 20102042 is about 4483.5300824239. The cubic root of 20102042 is about 271.9026197686.

Adding to 20102042 its reverse (24020102), we get a palindrome (44122144).

The spelling of 20102042 in words is "twenty million, one hundred two thousand, forty-two".