20729787807 has 8 divisors (see below), whose sum is σ = 28092827440. Its totient is φ = 13593303360.

The previous prime is 20729787803. The next prime is 20729787809. The reversal of 20729787807 is 70878792702.

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

It is not a de Polignac number, because 20729787807 - 2² = 20729787803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20729787803) 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, 56638582 + ... + 56638947.

It is an arithmetic number, because the mean of its divisors is an integer number (3511603430).

Almost surely, 2^20729787807 is an apocalyptic number.

20729787807 is a deficient number, since it is larger than the sum of its proper divisors (7363039633).

20729787807 is a wasteful number, since it uses less digits than its factorization.

20729787807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113277593.

The product of its (nonzero) digits is 5531904, while the sum is 57.

It can be divided in two parts, 2072 and 9787807, that added together give a palindrome (9789879).

The spelling of 20729787807 in words is "twenty billion, seven hundred twenty-nine million, seven hundred eighty-seven thousand, eight hundred seven".