20628394 has 8 divisors (see below), whose sum is σ = 31601088. Its totient is φ = 10094700.

The previous prime is 20628379. The next prime is 20628397. The reversal of 20628394 is 49382602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20628397) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 109632 + ... + 109819.

It is an arithmetic number, because the mean of its divisors is an integer number (3950136).

Almost surely, 2^20628394 is an apocalyptic number.

20628394 is a deficient number, since it is larger than the sum of its proper divisors (10972694).

20628394 is a wasteful number, since it uses less digits than its factorization.

20628394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219500.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 20628394 is about 4541.8491828769. The cubic root of 20628394 is about 274.2553695711.

The spelling of 20628394 in words is "twenty million, six hundred twenty-eight thousand, three hundred ninety-four".