20964423 has 4 divisors (see below), whose sum is σ = 27952568. Its totient is φ = 13976280.

The previous prime is 20964409. The next prime is 20964439. The reversal of 20964423 is 32446902.

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

It is not a de Polignac number, because 20964423 - 2¹⁰ = 20963399 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 (20964473) 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, 3494068 + ... + 3494073.

It is an arithmetic number, because the mean of its divisors is an integer number (6988142).

Almost surely, 2^20964423 is an apocalyptic number.

20964423 is a deficient number, since it is larger than the sum of its proper divisors (6988145).

20964423 is an equidigital number, since it uses as much as digits as its factorization.

20964423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6988144.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 20964423 is about 4578.6922805535. The cubic root of 20964423 is about 275.7365291829.

The spelling of 20964423 in words is "twenty million, nine hundred sixty-four thousand, four hundred twenty-three".