20949687240 has 32 divisors (see below), whose sum is σ = 62849062080. Its totient is φ = 5586583232.

The previous prime is 20949687181. The next prime is 20949687259. The reversal of 20949687240 is 4278694902.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87290244 + ... + 87290483.

It is an arithmetic number, because the mean of its divisors is an integer number (1964033190).

Almost surely, 2^20949687240 is an apocalyptic number.

20949687240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20949687240 is an abundant number, since it is smaller than the sum of its proper divisors (41899374840).

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

20949687240 is a wasteful number, since it uses less digits than its factorization.

20949687240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174580741 (or 174580737 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 20949687240 in words is "twenty billion, nine hundred forty-nine million, six hundred eighty-seven thousand, two hundred forty".