20566401423 has 32 divisors (see below), whose sum is σ = 29689390080. Its totient is φ = 12614215680.

The previous prime is 20566401391. The next prime is 20566401431. The reversal of 20566401423 is 32410466502.

It is not a de Polignac number, because 20566401423 - 2⁵ = 20566401391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20566403423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2106888 + ... + 2116626.

It is an arithmetic number, because the mean of its divisors is an integer number (927793440).

Almost surely, 2^20566401423 is an apocalyptic number.

20566401423 is a deficient number, since it is larger than the sum of its proper divisors (9122988657).

20566401423 is a wasteful number, since it uses less digits than its factorization.

20566401423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10687.

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 20566401423 its reverse (32410466502), we get a palindrome (52976867925).

The spelling of 20566401423 in words is "twenty billion, five hundred sixty-six million, four hundred one thousand, four hundred twenty-three".