20207825639 has 4 divisors (see below), whose sum is σ = 20637779424. Its totient is φ = 19777871856.

The previous prime is 20207825623. The next prime is 20207825647. The reversal of 20207825639 is 93652870202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93652870202 = 2 ⋅46826435101.

It is a cyclic number.

It is not a de Polignac number, because 20207825639 - 2⁴ = 20207825623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20207825639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20207825689) 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, 214976822 + ... + 214976915.

It is an arithmetic number, because the mean of its divisors is an integer number (5159444856).

Almost surely, 2^20207825639 is an apocalyptic number.

20207825639 is a deficient number, since it is larger than the sum of its proper divisors (429953785).

20207825639 is an equidigital number, since it uses as much as digits as its factorization.

20207825639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429953784.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 20207825639 in words is "twenty billion, two hundred seven million, eight hundred twenty-five thousand, six hundred thirty-nine".