20893423 has 2 divisors, whose sum is σ = 20893424. Its totient is φ = 20893422.

The previous prime is 20893393. The next prime is 20893429. The reversal of 20893423 is 32439802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20893423 - 2¹⁷ = 20762351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20893429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10446711 + 10446712.

It is an arithmetic number, because the mean of its divisors is an integer number (10446712).

Almost surely, 2^20893423 is an apocalyptic number.

20893423 is a deficient number, since it is larger than the sum of its proper divisors (1).

20893423 is an equidigital number, since it uses as much as digits as its factorization.

20893423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 20893423 is about 4570.9323994126. The cubic root of 20893423 is about 275.4248990785.

It can be divided in two parts, 20893 and 423, that added together give a square (21316 = 146²).

The spelling of 20893423 in words is "twenty million, eight hundred ninety-three thousand, four hundred twenty-three".