20539429 has 4 divisors (see below), whose sum is σ = 20786976. Its totient is φ = 20291884.

The previous prime is 20539427. The next prime is 20539433. The reversal of 20539429 is 92493502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92493502 = 2 ⋅46246751.

It is a cyclic number.

It is not a de Polignac number, because 20539429 - 2¹ = 20539427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20539394 and 20539403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20539427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123649 + ... + 123814.

It is an arithmetic number, because the mean of its divisors is an integer number (5196744).

Almost surely, 2^20539429 is an apocalyptic number.

It is an amenable number.

20539429 is a deficient number, since it is larger than the sum of its proper divisors (247547).

20539429 is an equidigital number, since it uses as much as digits as its factorization.

20539429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247546.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 20539429 is about 4532.0446820392. The cubic root of 20539429 is about 273.8605369442.

It can be divided in two parts, 205394 and 29, that multiplied together give a triangular number (5956426 = T₃₄₅₁).

The spelling of 20539429 in words is "twenty million, five hundred thirty-nine thousand, four hundred twenty-nine".