20351231142 has 32 divisors (see below), whose sum is σ = 44536881024. Its totient is φ = 6148401600.

The previous prime is 20351231123. The next prime is 20351231143. The reversal of 20351231142 is 24113215302.

It is a super-2 number, since 2×20351231142² (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 (20351231143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 443943 + ... + 487634.

It is an arithmetic number, because the mean of its divisors is an integer number (1391777532).

Almost surely, 2^20351231142 is an apocalyptic number.

20351231142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20351231142 is an abundant number, since it is smaller than the sum of its proper divisors (24185649882).

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

20351231142 is a wasteful number, since it uses less digits than its factorization.

20351231142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931924.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 20351231142 its reverse (24113215302), we get a palindrome (44464446444).

The spelling of 20351231142 in words is "twenty billion, three hundred fifty-one million, two hundred thirty-one thousand, one hundred forty-two".