20596978 has 4 divisors (see below), whose sum is σ = 30895470. Its totient is φ = 10298488.

The previous prime is 20596973. The next prime is 20596981. The reversal of 20596978 is 87969502.

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., 10843849 + 9753129 = 3293^2 + 3123^2 .

It is not an unprimeable number, because it can be changed into a prime (20596973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5149243 + ... + 5149246.

Almost surely, 2^20596978 is an apocalyptic number.

20596978 is a deficient number, since it is larger than the sum of its proper divisors (10298492).

20596978 is a wasteful number, since it uses less digits than its factorization.

20596978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10298491.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 20596978 is about 4538.3893618772. The cubic root of 20596978 is about 274.1160731510.

The spelling of 20596978 in words is "twenty million, five hundred ninety-six thousand, nine hundred seventy-eight".