20430642 has 16 divisors (see below), whose sum is σ = 40956192. Its totient is φ = 6794400.

The previous prime is 20430607. The next prime is 20430649. The reversal of 20430642 is 24603402.

It is a super-2 number, since 2×20430642² = 834822265064328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20430649) 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, 984 + ... + 6467.

It is an arithmetic number, because the mean of its divisors is an integer number (2559762).

Almost surely, 2^20430642 is an apocalyptic number.

20430642 is an abundant number, since it is smaller than the sum of its proper divisors (20525550).

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

20430642 is a wasteful number, since it uses less digits than its factorization.

20430642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7913.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 20430642 is about 4520.0267698322. The cubic root of 20430642 is about 273.3761804071.

The spelling of 20430642 in words is "twenty million, four hundred thirty thousand, six hundred forty-two".