20577780434 has 8 divisors (see below), whose sum is σ = 30868175100. Its totient is φ = 10288388736.

The previous prime is 20577780427. The next prime is 20577780511. The reversal of 20577780434 is 43408777502.

It can be written as a sum of positive squares in 2 ways, for example, as 19899334225 + 678446209 = 141065^2 + 26047^2 .

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, 197159 + ... + 282890.

Almost surely, 2^20577780434 is an apocalyptic number.

20577780434 is a deficient number, since it is larger than the sum of its proper divisors (10290394666).

20577780434 is a wasteful number, since it uses less digits than its factorization.

20577780434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501484.

The product of its (nonzero) digits is 1317120, while the sum is 47.

The spelling of 20577780434 in words is "twenty billion, five hundred seventy-seven million, seven hundred eighty thousand, four hundred thirty-four".