20287408807 has 4 divisors (see below), whose sum is σ = 20404677240. Its totient is φ = 20170140376.

The previous prime is 20287408787. The next prime is 20287408837. The reversal of 20287408807 is 70880478202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20287408807 is a prime.

It is a super-2 number, since 2×20287408807² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20287408837) 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, 58633957 + ... + 58634302.

It is an arithmetic number, because the mean of its divisors is an integer number (5101169310).

Almost surely, 2^20287408807 is an apocalyptic number.

20287408807 is a deficient number, since it is larger than the sum of its proper divisors (117268433).

20287408807 is a wasteful number, since it uses less digits than its factorization.

20287408807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117268432.

The product of its (nonzero) digits is 401408, while the sum is 46.

The spelling of 20287408807 in words is "twenty billion, two hundred eighty-seven million, four hundred eight thousand, eight hundred seven".