20636720286 has 32 divisors (see below), whose sum is σ = 50798082048. Its totient is φ = 5442651360.

The previous prime is 20636720239. The next prime is 20636720323. The reversal of 20636720286 is 68202763602.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18897550 + ... + 18898641.

It is an arithmetic number, because the mean of its divisors is an integer number (1587440064).

Almost surely, 2^20636720286 is an apocalyptic number.

20636720286 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20636720286 is an abundant number, since it is smaller than the sum of its proper divisors (30161361762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20636720286 is a wasteful number, since it uses less digits than its factorization.

20636720286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37796216.

The product of its (nonzero) digits is 290304, while the sum is 42.

The spelling of 20636720286 in words is "twenty billion, six hundred thirty-six million, seven hundred twenty thousand, two hundred eighty-six".