20785476097 has 4 divisors (see below), whose sum is σ = 20833479940. Its totient is φ = 20737472256.

The previous prime is 20785476091. The next prime is 20785476133. The reversal of 20785476097 is 79067458702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79067458702 = 2 ⋅39533729351.

It can be written as a sum of positive squares in 2 ways, for example, as 7794947521 + 12990528576 = 88289^2 + 113976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20785476097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20785476091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24001272 + ... + 24002137.

It is an arithmetic number, because the mean of its divisors is an integer number (5208369985).

Almost surely, 2^20785476097 is an apocalyptic number.

It is an amenable number.

20785476097 is a deficient number, since it is larger than the sum of its proper divisors (48003843).

20785476097 is an equidigital number, since it uses as much as digits as its factorization.

20785476097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48003842.

The product of its (nonzero) digits is 5927040, while the sum is 55.

The spelling of 20785476097 in words is "twenty billion, seven hundred eighty-five million, four hundred seventy-six thousand, ninety-seven".