20506807 has 8 divisors (see below), whose sum is σ = 20926080. Its totient is φ = 20090040.

The previous prime is 20506793. The next prime is 20506819. The reversal of 20506807 is 70860502.

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

It is a cyclic number.

It is not a de Polignac number, because 20506807 - 2¹⁹ = 19982519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506877) 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, 29332 + ... + 30022.

It is an arithmetic number, because the mean of its divisors is an integer number (2615760).

Almost surely, 2^20506807 is an apocalyptic number.

20506807 is a deficient number, since it is larger than the sum of its proper divisors (419273).

20506807 is an equidigital number, since it uses as much as digits as its factorization.

20506807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 20506807 is about 4528.4442140762. Note that the first 3 decimals coincide. The cubic root of 20506807 is about 273.7154726649.

The spelling of 20506807 in words is "twenty million, five hundred six thousand, eight hundred seven".