20826448477 has 4 divisors (see below), whose sum is σ = 20826845820. Its totient is φ = 20826051136.

The previous prime is 20826448403. The next prime is 20826448507. The reversal of 20826448477 is 77484462802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18005882596 + 2820565881 = 134186^2 + 53109^2 .

It is a cyclic number.

It is not a de Polignac number, because 20826448477 - 2²⁷ = 20692230749 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 (20826448277) 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, 105478 + ... + 229735.

It is an arithmetic number, because the mean of its divisors is an integer number (5206711455).

Almost surely, 2^20826448477 is an apocalyptic number.

It is an amenable number.

20826448477 is a deficient number, since it is larger than the sum of its proper divisors (397343).

20826448477 is an equidigital number, since it uses as much as digits as its factorization.

20826448477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397342.

The product of its (nonzero) digits is 4816896, while the sum is 52.

The spelling of 20826448477 in words is "twenty billion, eight hundred twenty-six million, four hundred forty-eight thousand, four hundred seventy-seven".