20791637845 has 16 divisors (see below), whose sum is σ = 28096151040. Its totient is φ = 14633409600.

The previous prime is 20791637843. The next prime is 20791637869. The reversal of 20791637845 is 54873619702.

It is not a de Polignac number, because 20791637845 - 2¹ = 20791637843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20791637792 and 20791637801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20791637843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6095550 + ... + 6098959.

It is an arithmetic number, because the mean of its divisors is an integer number (1756009440).

It is a 2-persistent number, because it is pandigital, and so is 2⋅20791637845 = 41583275690, but 3⋅20791637845 = 62374913535 is not.

Almost surely, 2^20791637845 is an apocalyptic number.

It is an amenable number.

20791637845 is a deficient number, since it is larger than the sum of its proper divisors (7304513195).

20791637845 is a wasteful number, since it uses less digits than its factorization.

20791637845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12194556.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 20791637845 in words is "twenty billion, seven hundred ninety-one million, six hundred thirty-seven thousand, eight hundred forty-five".