20812423 has 2 divisors, whose sum is σ = 20812424. Its totient is φ = 20812422.

The previous prime is 20812409. The next prime is 20812433. The reversal of 20812423 is 32421802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20812423 - 2⁹ = 20811911 is a prime.

It is a super-2 number, since 2×20812423² = 866313902261858, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20812394 and 20812403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20812433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10406211 + 10406212.

It is an arithmetic number, because the mean of its divisors is an integer number (10406212).

Almost surely, 2^20812423 is an apocalyptic number.

20812423 is a deficient number, since it is larger than the sum of its proper divisors (1).

20812423 is an equidigital number, since it uses as much as digits as its factorization.

20812423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20812423 is about 4562.0634585678. The cubic root of 20812423 is about 275.0685140583.

The spelling of 20812423 in words is "twenty million, eight hundred twelve thousand, four hundred twenty-three".