20620643 has 8 divisors (see below), whose sum is σ = 22983120. Its totient is φ = 18385920.

The previous prime is 20620637. The next prime is 20620651. The reversal of 20620643 is 34602602.

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

It is not a de Polignac number, because 20620643 - 2²² = 16426339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20620843) 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 7 ways as a sum of consecutive naturals, for example, 31598 + ... + 32243.

It is an arithmetic number, because the mean of its divisors is an integer number (2872890).

Almost surely, 2^20620643 is an apocalyptic number.

20620643 is a deficient number, since it is larger than the sum of its proper divisors (2362477).

20620643 is a wasteful number, since it uses less digits than its factorization.

20620643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63877.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 20620643 is about 4540.9958158977. The cubic root of 20620643 is about 274.2210153104.

The spelling of 20620643 in words is "twenty million, six hundred twenty thousand, six hundred forty-three".