20636028639 has 16 divisors (see below), whose sum is σ = 30602114400. Its totient is φ = 13743753408.

The previous prime is 20636028619. The next prime is 20636028659. The reversal of 20636028639 is 93682063602.

20636028639 is a `hidden beast` number, since 2 + 0 + 6 + 3 + 6 + 0 + 2 + 8 + 639 = 666.

It is an interprime number because it is at equal distance from previous prime (20636028619) and next prime (20636028659).

It is not a de Polignac number, because 20636028639 - 2¹¹ = 20636026591 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20636028594 and 20636028603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20636028619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349894 + ... + 404595.

It is an arithmetic number, because the mean of its divisors is an integer number (1912632150).

Almost surely, 2^20636028639 is an apocalyptic number.

20636028639 is a deficient number, since it is larger than the sum of its proper divisors (9966085761).

20636028639 is a wasteful number, since it uses less digits than its factorization.

20636028639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755511 (or 755505 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The spelling of 20636028639 in words is "twenty billion, six hundred thirty-six million, twenty-eight thousand, six hundred thirty-nine".