20547430 has 16 divisors (see below), whose sum is σ = 37402560. Its totient is φ = 8126272.

The previous prime is 20547427. The next prime is 20547431. The reversal of 20547430 is 3474502.

It is a junction number, because it is equal to n+sod(n) for n = 20547395 and 20547404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20547431) by changing a digit.

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, 10654 + ... + 12433.

It is an arithmetic number, because the mean of its divisors is an integer number (2337660).

Almost surely, 2^20547430 is an apocalyptic number.

20547430 is a deficient number, since it is larger than the sum of its proper divisors (16855130).

20547430 is a wasteful number, since it uses less digits than its factorization.

20547430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23183.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 20547430 is about 4532.9273102489. The cubic root of 20547430 is about 273.8960925204.

The spelling of 20547430 in words is "twenty million, five hundred forty-seven thousand, four hundred thirty".