20620641 has 8 divisors (see below), whose sum is σ = 27663520. Its totient is φ = 13662432.

The previous prime is 20620637. The next prime is 20620651. The reversal of 20620641 is 14602602.

It is a happy number.

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

It is not a de Polignac number, because 20620641 - 2² = 20620637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20620651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20596 + ... + 21573.

It is an arithmetic number, because the mean of its divisors is an integer number (3457940).

Almost surely, 2^20620641 is an apocalyptic number.

It is an amenable number.

20620641 is a deficient number, since it is larger than the sum of its proper divisors (7042879).

20620641 is a wasteful number, since it uses less digits than its factorization.

20620641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42335.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20620641 is about 4540.9955956816. The cubic root of 20620641 is about 274.2210064449.

The spelling of 20620641 in words is "twenty million, six hundred twenty thousand, six hundred forty-one".