20628814 has 4 divisors (see below), whose sum is σ = 30943224. Its totient is φ = 10314406.

The previous prime is 20628809. The next prime is 20628821. The reversal of 20628814 is 41882602.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5157202 + ... + 5157205.

It is an arithmetic number, because the mean of its divisors is an integer number (7735806).

Almost surely, 2^20628814 is an apocalyptic number.

20628814 is a deficient number, since it is larger than the sum of its proper divisors (10314410).

20628814 is a wasteful number, since it uses less digits than its factorization.

20628814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10314409.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 20628814 is about 4541.8954193156. The cubic root of 20628814 is about 274.2572308643.

The spelling of 20628814 in words is "twenty million, six hundred twenty-eight thousand, eight hundred fourteen".