20706778508 has 24 divisors (see below), whose sum is σ = 39056604048. Its totient is φ = 9549066816.

The previous prime is 20706778459. The next prime is 20706778541. The reversal of 20706778508 is 80587760702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101066 + ... + 227217.

It is an arithmetic number, because the mean of its divisors is an integer number (1627358502).

Almost surely, 2^20706778508 is an apocalyptic number.

It is an amenable number.

20706778508 is a deficient number, since it is larger than the sum of its proper divisors (18349825540).

20706778508 is a wasteful number, since it uses less digits than its factorization.

20706778508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329513 (or 329511 counting only the distinct ones).

The product of its (nonzero) digits is 1317120, while the sum is 50.

The spelling of 20706778508 in words is "twenty billion, seven hundred six million, seven hundred seventy-eight thousand, five hundred eight".