20530429 has 4 divisors (see below), whose sum is σ = 20649276. Its totient is φ = 20411584.

The previous prime is 20530427. The next prime is 20530453. The reversal of 20530429 is 92403502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92403502 = 2 ⋅46201751.

It can be written as a sum of positive squares in 2 ways, for example, as 19316025 + 1214404 = 4395^2 + 1102^2 .

It is a cyclic number.

It is not a de Polignac number, because 20530429 - 2¹ = 20530427 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20530423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59164 + ... + 59509.

It is an arithmetic number, because the mean of its divisors is an integer number (5162319).

Almost surely, 2^20530429 is an apocalyptic number.

It is an amenable number.

20530429 is a deficient number, since it is larger than the sum of its proper divisors (118847).

20530429 is a wasteful number, since it uses less digits than its factorization.

20530429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118846.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20530429 is about 4531.0516439343. The cubic root of 20530429 is about 273.8205308836.

The spelling of 20530429 in words is "twenty million, five hundred thirty thousand, four hundred twenty-nine".