20732678 has 4 divisors (see below), whose sum is σ = 31099020. Its totient is φ = 10366338.

The previous prime is 20732627. The next prime is 20732689. The reversal of 20732678 is 87623702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87623702 = 2 ⋅43811851.

It is a Curzon number.

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, 5183168 + ... + 5183171.

It is an arithmetic number, because the mean of its divisors is an integer number (7774755).

Almost surely, 2^20732678 is an apocalyptic number.

20732678 is a deficient number, since it is larger than the sum of its proper divisors (10366342).

20732678 is a wasteful number, since it uses less digits than its factorization.

20732678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10366341.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 20732678 is about 4553.3150560883. The cubic root of 20732678 is about 274.7167463617.

The spelling of 20732678 in words is "twenty million, seven hundred thirty-two thousand, six hundred seventy-eight".