20813623477 has 4 divisors (see below), whose sum is σ = 20861035360. Its totient is φ = 20766211596.

The previous prime is 20813623471. The next prime is 20813623487. The reversal of 20813623477 is 77432631802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20813623477 - 2⁷ = 20813623349 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 (20813623471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23705283 + ... + 23706160.

It is an arithmetic number, because the mean of its divisors is an integer number (5215258840).

Almost surely, 2^20813623477 is an apocalyptic number.

It is an amenable number.

20813623477 is a deficient number, since it is larger than the sum of its proper divisors (47411883).

20813623477 is an equidigital number, since it uses as much as digits as its factorization.

20813623477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47411882.

The product of its (nonzero) digits is 338688, while the sum is 43.

The spelling of 20813623477 in words is "twenty billion, eight hundred thirteen million, six hundred twenty-three thousand, four hundred seventy-seven".