20520429 has 16 divisors (see below), whose sum is σ = 28512000. Its totient is φ = 13111616.

The previous prime is 20520421. The next prime is 20520433. The reversal of 20520429 is 92402502.

20520429 = T₂₁₂ + T₂₁₃ + ... + T₅₀₉.

It is a cyclic number.

It is not a de Polignac number, because 20520429 - 2³ = 20520421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20520399 and 20520408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12172 + ... + 13754.

It is an arithmetic number, because the mean of its divisors is an integer number (1782000).

Almost surely, 2^20520429 is an apocalyptic number.

20520429 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20520429 is a deficient number, since it is larger than the sum of its proper divisors (7991571).

20520429 is a wasteful number, since it uses less digits than its factorization.

20520429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20520429 is about 4529.9480129467. The cubic root of 20520429 is about 273.7760659903.

The spelling of 20520429 in words is "twenty million, five hundred twenty thousand, four hundred twenty-nine".