20806455862 has 4 divisors (see below), whose sum is σ = 31209683796. Its totient is φ = 10403227930.

The previous prime is 20806455827. The next prime is 20806455869. The reversal of 20806455862 is 26855460802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 26855460802 = 2 ⋅13427730401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20806455869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5201613964 + ... + 5201613967.

It is an arithmetic number, because the mean of its divisors is an integer number (7802420949).

Almost surely, 2^20806455862 is an apocalyptic number.

20806455862 is a deficient number, since it is larger than the sum of its proper divisors (10403227934).

20806455862 is a wasteful number, since it uses less digits than its factorization.

20806455862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10403227933.

The product of its (nonzero) digits is 921600, while the sum is 46.

The spelling of 20806455862 in words is "twenty billion, eight hundred six million, four hundred fifty-five thousand, eight hundred sixty-two".