20636425887 has 16 divisors (see below), whose sum is σ = 34304708352. Its totient is φ = 10720221120.

The previous prime is 20636425853. The next prime is 20636425951. The reversal of 20636425887 is 78852463602.

It is not a de Polignac number, because 20636425887 - 2¹¹ = 20636423839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20636425087) 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, 44667358 + ... + 44667819.

It is an arithmetic number, because the mean of its divisors is an integer number (2144044272).

Almost surely, 2^20636425887 is an apocalyptic number.

20636425887 is a deficient number, since it is larger than the sum of its proper divisors (13668282465).

20636425887 is a wasteful number, since it uses less digits than its factorization.

20636425887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89335198.

The product of its (nonzero) digits is 3870720, while the sum is 51.

The spelling of 20636425887 in words is "twenty billion, six hundred thirty-six million, four hundred twenty-five thousand, eight hundred eighty-seven".