20487980236 has 12 divisors (see below), whose sum is σ = 37963022328. Its totient is φ = 9641402432.

The previous prime is 20487980209. The next prime is 20487980239. The reversal of 20487980236 is 63208978402.

It is a self number, because there is not a number n which added to its sum of digits gives 20487980236.

It is not an unprimeable number, because it can be changed into a prime (20487980239) 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, 150646846 + ... + 150646981.

It is an arithmetic number, because the mean of its divisors is an integer number (3163585194).

Almost surely, 2^20487980236 is an apocalyptic number.

It is an amenable number.

20487980236 is a deficient number, since it is larger than the sum of its proper divisors (17475042092).

20487980236 is a wasteful number, since it uses less digits than its factorization.

20487980236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301293848 (or 301293846 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 20487980236 in words is "twenty billion, four hundred eighty-seven million, nine hundred eighty thousand, two hundred thirty-six".