20787637632243 has 32 divisors (see below), whose sum is σ = 28686965486400. Its totient is φ = 13373848320000.

The previous prime is 20787637632197. The next prime is 20787637632253. The reversal of 20787637632243 is 34223673678702.

It is a happy number.

It is not a de Polignac number, because 20787637632243 - 2¹⁷ = 20787637501171 is a prime.

It is a super-2 number, since 2×20787637632243² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20787637632253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2445312493 + ... + 2445320993.

It is an arithmetic number, because the mean of its divisors is an integer number (896467671450).

Almost surely, 2^{20787637632243} is an apocalyptic number.

20787637632243 is a deficient number, since it is larger than the sum of its proper divisors (7899327854157).

20787637632243 is a wasteful number, since it uses less digits than its factorization.

20787637632243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19303.

The product of its (nonzero) digits is 85349376, while the sum is 60.

The spelling of 20787637632243 in words is "twenty trillion, seven hundred eighty-seven billion, six hundred thirty-seven million, six hundred thirty-two thousand, two hundred forty-three".