20163278 has 4 divisors (see below), whose sum is σ = 30244920. Its totient is φ = 10081638.

The previous prime is 20163271. The next prime is 20163287. The reversal of 20163278 is 87236102.

It is a happy number.

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

It is a Curzon number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 20163278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20163271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5040818 + ... + 5040821.

It is an arithmetic number, because the mean of its divisors is an integer number (7561230).

Almost surely, 2^20163278 is an apocalyptic number.

20163278 is a deficient number, since it is larger than the sum of its proper divisors (10081642).

20163278 is a wasteful number, since it uses less digits than its factorization.

20163278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10081641.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20163278 is about 4490.3538836043. The cubic root of 20163278 is about 272.1784350384.

The spelling of 20163278 in words is "twenty million, one hundred sixty-three thousand, two hundred seventy-eight".