20278018934 has 4 divisors (see below), whose sum is σ = 30417028404. Its totient is φ = 10139009466.

The previous prime is 20278018909. The next prime is 20278018967. The reversal of 20278018934 is 43981087202.

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

It is a super-2 number, since 2×20278018934² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5069504732 + ... + 5069504735.

It is an arithmetic number, because the mean of its divisors is an integer number (7604257101).

Almost surely, 2^20278018934 is an apocalyptic number.

20278018934 is a deficient number, since it is larger than the sum of its proper divisors (10139009470).

20278018934 is a wasteful number, since it uses less digits than its factorization.

20278018934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10139009469.

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 20278018934 in words is "twenty billion, two hundred seventy-eight million, eighteen thousand, nine hundred thirty-four".