20861778532 has 48 divisors (see below), whose sum is σ = 41918090368. Its totient is φ = 8899165440.

The previous prime is 20861778521. The next prime is 20861778577. The reversal of 20861778532 is 23587716802.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8775328 + ... + 8777704.

Almost surely, 2^20861778532 is an apocalyptic number.

It is an amenable number.

20861778532 is an abundant number, since it is smaller than the sum of its proper divisors (21056311836).

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

20861778532 is a wasteful number, since it uses less digits than its factorization.

20861778532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3716 (or 3714 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 20861778532 in words is "twenty billion, eight hundred sixty-one million, seven hundred seventy-eight thousand, five hundred thirty-two".