20787430 has 16 divisors (see below), whose sum is σ = 39618720. Its totient is φ = 7825792.

The previous prime is 20787419. The next prime is 20787457. The reversal of 20787430 is 3478702.

It is a junction number, because it is equal to n+sod(n) for n = 20787392 and 20787401.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60970 + ... + 61309.

It is an arithmetic number, because the mean of its divisors is an integer number (2476170).

Almost surely, 2^20787430 is an apocalyptic number.

20787430 is a deficient number, since it is larger than the sum of its proper divisors (18831290).

20787430 is a wasteful number, since it uses less digits than its factorization.

20787430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122303.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 20787430 is about 4559.3234147185. The cubic root of 20787430 is about 274.9583628421.

The spelling of 20787430 in words is "twenty million, seven hundred eighty-seven thousand, four hundred thirty".