20628730 has 8 divisors (see below), whose sum is σ = 37131732. Its totient is φ = 8251488.

The previous prime is 20628709. The next prime is 20628731. The reversal of 20628730 is 3782602.

It can be written as a sum of positive squares in 2 ways, for example, as 20097289 + 531441 = 4483^2 + 729^2 .

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 (20628731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1031427 + ... + 1031446.

Almost surely, 2^20628730 is an apocalyptic number.

20628730 is a deficient number, since it is larger than the sum of its proper divisors (16503002).

20628730 is a wasteful number, since it uses less digits than its factorization.

20628730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2062880.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20628730 is about 4541.8861720655. The cubic root of 20628730 is about 274.2568586077.

The spelling of 20628730 in words is "twenty million, six hundred twenty-eight thousand, seven hundred thirty".