20953190787 has 4 divisors (see below), whose sum is σ = 27937587720. Its totient is φ = 13968793856.

The previous prime is 20953190717. The next prime is 20953190789. The reversal of 20953190787 is 78709135902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20953190787 - 2¹⁸ = 20952928643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20953190789) 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, 3492198462 + ... + 3492198467.

It is an arithmetic number, because the mean of its divisors is an integer number (6984396930).

Almost surely, 2^20953190787 is an apocalyptic number.

20953190787 is a deficient number, since it is larger than the sum of its proper divisors (6984396933).

20953190787 is an equidigital number, since it uses as much as digits as its factorization.

20953190787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6984396932.

The product of its (nonzero) digits is 952560, while the sum is 51.

The spelling of 20953190787 in words is "twenty billion, nine hundred fifty-three million, one hundred ninety thousand, seven hundred eighty-seven".