20430972 has 18 divisors (see below), whose sum is σ = 51645048. Its totient is φ = 6810312.

The previous prime is 20430941. The next prime is 20430973. The reversal of 20430972 is 27903402.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430973) 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 5 ways as a sum of consecutive naturals, for example, 283728 + ... + 283799.

Almost surely, 2^20430972 is an apocalyptic number.

It is an amenable number.

20430972 is an abundant number, since it is smaller than the sum of its proper divisors (31214076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20430972 is a wasteful number, since it uses less digits than its factorization.

20430972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567537 (or 567532 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20430972 is about 4520.0632738934. The cubic root of 20430972 is about 273.3776522756.

The spelling of 20430972 in words is "twenty million, four hundred thirty thousand, nine hundred seventy-two".