20009616 has 40 divisors (see below), whose sum is σ = 56392224. Its totient is φ = 6063360.

The previous prime is 20009611. The next prime is 20009651. The reversal of 20009616 is 61690002.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (20009611) 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, 18421 + ... + 19476.

Almost surely, 2^20009616 is an apocalyptic number.

It is an amenable number.

20009616 is an abundant number, since it is smaller than the sum of its proper divisors (36382608).

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

20009616 is a wasteful number, since it uses less digits than its factorization.

20009616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37919 (or 37913 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 20009616 is about 4473.2109272870. The cubic root of 20009616 is about 271.4852577556.

Adding to 20009616 its reverse (61690002), we get a palindrome (81699618).

The spelling of 20009616 in words is "twenty million, nine thousand, six hundred sixteen".