20961377187 has 8 divisors (see below), whose sum is σ = 27966009936. Its totient is φ = 13965497952.

The previous prime is 20961377183. The next prime is 20961377197. The reversal of 20961377187 is 78177316902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20961377187 - 2² = 20961377183 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20961377183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2182788 + ... + 2192369.

It is an arithmetic number, because the mean of its divisors is an integer number (3495751242).

Almost surely, 2^20961377187 is an apocalyptic number.

20961377187 is a deficient number, since it is larger than the sum of its proper divisors (7004632749).

20961377187 is a wasteful number, since it uses less digits than its factorization.

20961377187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4376757.

The product of its (nonzero) digits is 889056, while the sum is 51.

The spelling of 20961377187 in words is "twenty billion, nine hundred sixty-one million, three hundred seventy-seven thousand, one hundred eighty-seven".