20620705 has 8 divisors (see below), whose sum is σ = 28279872. Its totient is φ = 14139888.

The previous prime is 20620687. The next prime is 20620709. The reversal of 20620705 is 50702602.

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

It is not a de Polignac number, because 20620705 - 2¹³ = 20612513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20620709) 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, 294547 + ... + 294616.

It is an arithmetic number, because the mean of its divisors is an integer number (3534984).

Almost surely, 2^20620705 is an apocalyptic number.

It is an amenable number.

20620705 is a deficient number, since it is larger than the sum of its proper divisors (7659167).

20620705 is an equidigital number, since it uses as much as digits as its factorization.

20620705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589175.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20620705 is about 4541.0026425890. The cubic root of 20620705 is about 274.2212901432.

The spelling of 20620705 in words is "twenty million, six hundred twenty thousand, seven hundred five".