20924797785 has 8 divisors (see below), whose sum is σ = 33479676480. Its totient is φ = 11159892144.

The previous prime is 20924797783. The next prime is 20924797813. The reversal of 20924797785 is 58779742902.

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

It is not a de Polignac number, because 20924797785 - 2¹ = 20924797783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20924797783) 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, 697493245 + ... + 697493274.

It is an arithmetic number, because the mean of its divisors is an integer number (4184959560).

Almost surely, 2^20924797785 is an apocalyptic number.

It is an amenable number.

20924797785 is a deficient number, since it is larger than the sum of its proper divisors (12554878695).

20924797785 is a wasteful number, since it uses less digits than its factorization.

20924797785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394986527.

The product of its (nonzero) digits is 17781120, while the sum is 60.

The spelling of 20924797785 in words is "twenty billion, nine hundred twenty-four million, seven hundred ninety-seven thousand, seven hundred eighty-five".