20131244442 has 80 divisors (see below), whose sum is σ = 47700221184. Its totient is φ = 6335496000.

The previous prime is 20131244437. The next prime is 20131244449. The reversal of 20131244442 is 24444213102.

20131244442 is a `hidden beast` number, since 201 + 3 + 12 + 4 + 4 + 442 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20131244449) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 157017 + ... + 254787.

Almost surely, 2^20131244442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20131244442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23850110592).

20131244442 is an abundant number, since it is smaller than the sum of its proper divisors (27568976742).

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

20131244442 is a wasteful number, since it uses less digits than its factorization.

20131244442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97857 (or 97848 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 20131244442 its reverse (24444213102), we get a palindrome (44575457544).

The spelling of 20131244442 in words is "twenty billion, one hundred thirty-one million, two hundred forty-four thousand, four hundred forty-two".