20102142142 has 4 divisors (see below), whose sum is σ = 30153213216. Its totient is φ = 10051071070.

The previous prime is 20102142113. The next prime is 20102142149. The reversal of 20102142142 is 24124120102.

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

It is a super-2 number, since 2×20102142142² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102142149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5025535534 + ... + 5025535537.

It is an arithmetic number, because the mean of its divisors is an integer number (7538303304).

Almost surely, 2^20102142142 is an apocalyptic number.

20102142142 is a deficient number, since it is larger than the sum of its proper divisors (10051071074).

20102142142 is a wasteful number, since it uses less digits than its factorization.

20102142142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10051071073.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20102142142 its reverse (24124120102), we get a palindrome (44226262244).

The spelling of 20102142142 in words is "twenty billion, one hundred two million, one hundred forty-two thousand, one hundred forty-two".