20774428154 has 8 divisors (see below), whose sum is σ = 31239353268. Its totient is φ = 10361310400.

The previous prime is 20774428153. The next prime is 20774428159. The reversal of 20774428154 is 45182447702.

It can be written as a sum of positive squares in 2 ways, for example, as 20772592129 + 1836025 = 144127^2 + 1355^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20774428153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12950837 + ... + 12952440.

Almost surely, 2^20774428154 is an apocalyptic number.

20774428154 is a deficient number, since it is larger than the sum of its proper divisors (10464925114).

20774428154 is a wasteful number, since it uses less digits than its factorization.

20774428154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25903680.

The product of its (nonzero) digits is 501760, while the sum is 44.

The spelling of 20774428154 in words is "twenty billion, seven hundred seventy-four million, four hundred twenty-eight thousand, one hundred fifty-four".