20533429 has 4 divisors (see below), whose sum is σ = 23466784. Its totient is φ = 17600076.

The previous prime is 20533427. The next prime is 20533451. The reversal of 20533429 is 92433502.

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.

It is a cyclic number.

It is not a de Polignac number, because 20533429 - 2¹ = 20533427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20533397 and 20533406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20533427) 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, 1466667 + ... + 1466680.

It is an arithmetic number, because the mean of its divisors is an integer number (5866696).

Almost surely, 2^20533429 is an apocalyptic number.

It is an amenable number.

20533429 is a deficient number, since it is larger than the sum of its proper divisors (2933355).

20533429 is an equidigital number, since it uses as much as digits as its factorization.

20533429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2933354.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 20533429 is about 4531.3826808161. The cubic root of 20533429 is about 273.8338675360.

It can be divided in two parts, 2053342 and 9, that added together give a triangular number (2053351 = T₂₀₂₆).

The spelling of 20533429 in words is "twenty million, five hundred thirty-three thousand, four hundred twenty-nine".