20402311442 has 8 divisors (see below), whose sum is σ = 31105163532. Its totient is φ = 10033923600.

The previous prime is 20402311417. The next prime is 20402311459. The reversal of 20402311442 is 24411320402.

It can be written as a sum of positive squares in 2 ways, for example, as 18733670641 + 1668640801 = 136871^2 + 40849^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83615909 + ... + 83616152.

Almost surely, 2^20402311442 is an apocalyptic number.

20402311442 is a deficient number, since it is larger than the sum of its proper divisors (10702852090).

20402311442 is a wasteful number, since it uses less digits than its factorization.

20402311442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167232124.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 20402311442 its reverse (24411320402), we get a palindrome (44813631844).

The spelling of 20402311442 in words is "twenty billion, four hundred two million, three hundred eleven thousand, four hundred forty-two".