20430136 has 32 divisors (see below), whose sum is σ = 39564000. Its totient is φ = 9884160.

The previous prime is 20430131. The next prime is 20430143. The reversal of 20430136 is 63103402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430131) 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, 65116 + ... + 65428.

It is an arithmetic number, because the mean of its divisors is an integer number (1236375).

Almost surely, 2^20430136 is an apocalyptic number.

It is an amenable number.

20430136 is a deficient number, since it is larger than the sum of its proper divisors (19133864).

20430136 is a wasteful number, since it uses less digits than its factorization.

20430136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559 (or 555 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 20430136 is about 4519.9707963658. The cubic root of 20430136 is about 273.3739235113.

Adding to 20430136 its reverse (63103402), we get a palindrome (83533538).

The spelling of 20430136 in words is "twenty million, four hundred thirty thousand, one hundred thirty-six".