20709687546 has 48 divisors (see below), whose sum is σ = 45013497984. Its totient is φ = 6881346432.

The previous prime is 20709687491. The next prime is 20709687587. The reversal of 20709687546 is 64578690702.

20709687546 is a `hidden beast` number, since 2 + 0 + 7 + 0 + 96 + 8 + 7 + 546 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20709687492 and 20709687501.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11653410 + ... + 11655186.

It is an arithmetic number, because the mean of its divisors is an integer number (937781208).

Almost surely, 2^20709687546 is an apocalyptic number.

20709687546 is an abundant number, since it is smaller than the sum of its proper divisors (24303810438).

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

20709687546 is a wasteful number, since it uses less digits than its factorization.

20709687546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3475 (or 3472 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 20709687546 in words is "twenty billion, seven hundred nine million, six hundred eighty-seven thousand, five hundred forty-six".