20331429 has 8 divisors (see below), whose sum is σ = 27195360. Its totient is φ = 13510896.

The previous prime is 20331419. The next prime is 20331461. The reversal of 20331429 is 92413302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20331429 - 2⁴ = 20331413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20331399 and 20331408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9739 + ... + 11640.

It is an arithmetic number, because the mean of its divisors is an integer number (3399420).

Almost surely, 2^20331429 is an apocalyptic number.

It is an amenable number.

20331429 is a deficient number, since it is larger than the sum of its proper divisors (6863931).

20331429 is a wasteful number, since it uses less digits than its factorization.

20331429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21699.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20331429 is about 4509.0385893226. The cubic root of 20331429 is about 272.9329492244.

The spelling of 20331429 in words is "twenty million, three hundred thirty-one thousand, four hundred twenty-nine".