20954841599 has 4 divisors (see below), whose sum is σ = 20956084200. Its totient is φ = 20953599000.

The previous prime is 20954841569. The next prime is 20954841647. The reversal of 20954841599 is 99514845902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99514845902 = 2 ⋅49757422951.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20954841599 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 (20954841569) 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, 595652 + ... + 629849.

It is an arithmetic number, because the mean of its divisors is an integer number (5239021050).

Almost surely, 2^20954841599 is an apocalyptic number.

20954841599 is a deficient number, since it is larger than the sum of its proper divisors (1242601).

20954841599 is a wasteful number, since it uses less digits than its factorization.

20954841599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242600.

The product of its (nonzero) digits is 4665600, while the sum is 56.

The spelling of 20954841599 in words is "twenty billion, nine hundred fifty-four million, eight hundred forty-one thousand, five hundred ninety-nine".