20442396778 has 4 divisors (see below), whose sum is σ = 30663595170. Its totient is φ = 10221198388.

The previous prime is 20442396769. The next prime is 20442396791. The reversal of 20442396778 is 87769324402.

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

It can be written as a sum of positive squares in only one way, i.e., 16818717969 + 3623678809 = 129687^2 + 60197^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110599193 + ... + 5110599196.

Almost surely, 2^20442396778 is an apocalyptic number.

20442396778 is a deficient number, since it is larger than the sum of its proper divisors (10221198392).

20442396778 is a wasteful number, since it uses less digits than its factorization.

20442396778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10221198391.

The product of its (nonzero) digits is 4064256, while the sum is 52.

The spelling of 20442396778 in words is "twenty billion, four hundred forty-two million, three hundred ninety-six thousand, seven hundred seventy-eight".