20423329 has 2 divisors, whose sum is σ = 20423330. Its totient is φ = 20423328.

The previous prime is 20423257. The next prime is 20423353. The reversal of 20423329 is 92332402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18662400 + 1760929 = 4320^2 + 1327^2 .

It is a cyclic number.

It is not a de Polignac number, because 20423329 - 2⁷ = 20423201 is a prime.

It is a super-2 number, since 2×20423329² = 834224734884482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20423369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211664 + 10211665.

It is an arithmetic number, because the mean of its divisors is an integer number (10211665).

Almost surely, 2^20423329 is an apocalyptic number.

It is an amenable number.

20423329 is a deficient number, since it is larger than the sum of its proper divisors (1).

20423329 is an equidigital number, since it uses as much as digits as its factorization.

20423329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20423329 is about 4519.2177420434. The cubic root of 20423329 is about 273.3435588415.

The spelling of 20423329 in words is "twenty million, four hundred twenty-three thousand, three hundred twenty-nine".