20487429 has 12 divisors (see below), whose sum is σ = 29701932. Its totient is φ = 13608000.

The previous prime is 20487407. The next prime is 20487433. The reversal of 20487429 is 92478402.

It can be written as a sum of positive squares in 2 ways, for example, as 18533025 + 1954404 = 4305^2 + 1398^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20487429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20487393 and 20487402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20487449) 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 11 ways as a sum of consecutive naturals, for example, 1522 + ... + 6579.

It is an arithmetic number, because the mean of its divisors is an integer number (2475161).

Almost surely, 2^20487429 is an apocalyptic number.

It is an amenable number.

20487429 is a deficient number, since it is larger than the sum of its proper divisors (9214503).

20487429 is a wasteful number, since it uses less digits than its factorization.

20487429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8388 (or 8385 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20487429 is about 4526.3041214660. The cubic root of 20487429 is about 273.6292292693.

The spelling of 20487429 in words is "twenty million, four hundred eighty-seven thousand, four hundred twenty-nine".