20551132442 has 8 divisors (see below), whose sum is σ = 31051711476. Its totient is φ = 10200561952.

The previous prime is 20551132423. The next prime is 20551132457. The reversal of 20551132442 is 24423115502.

It can be written as a sum of positive squares in 2 ways, for example, as 20546642281 + 4490161 = 143341^2 + 2119^2 .

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, 37501793 + ... + 37502340.

Almost surely, 2^20551132442 is an apocalyptic number.

20551132442 is a deficient number, since it is larger than the sum of its proper divisors (10500579034).

20551132442 is a wasteful number, since it uses less digits than its factorization.

20551132442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75004272.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 20551132442 its reverse (24423115502), we get a palindrome (44974247944).

The spelling of 20551132442 in words is "twenty billion, five hundred fifty-one million, one hundred thirty-two thousand, four hundred forty-two".