20429223 has 16 divisors (see below), whose sum is σ = 28942560. Its totient is φ = 12773376.

The previous prime is 20429203. The next prime is 20429249. The reversal of 20429223 is 32292402.

It is not a de Polignac number, because 20429223 - 2⁵ = 20429191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20429193 and 20429202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20429203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19743 + ... + 20751.

It is an arithmetic number, because the mean of its divisors is an integer number (1808910).

Almost surely, 2^20429223 is an apocalyptic number.

20429223 is a deficient number, since it is larger than the sum of its proper divisors (8513337).

20429223 is a wasteful number, since it uses less digits than its factorization.

20429223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20429223 is about 4519.8697990097. The cubic root of 20429223 is about 273.3698511920.

The spelling of 20429223 in words is "twenty million, four hundred twenty-nine thousand, two hundred twenty-three".