20235916009 has 9 divisors (see below), whose sum is σ = 21359872317. Its totient is φ = 19168307244.

The previous prime is 20235915989. The next prime is 20235916081. The reversal of 20235916009 is 90061953202.

The square root of 20235916009 is 142253.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-20235916009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20235916109) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2699064 + ... + 2706550.

Almost surely, 2^20235916009 is an apocalyptic number.

20235916009 is the 142253-rd square number.

20235916009 is the 71127-th centered octagonal number.

It is an amenable number.

20235916009 is a deficient number, since it is larger than the sum of its proper divisors (1123956308).

20235916009 is an frugal number, since it uses more digits than its factorization.

20235916009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15012 (or 7506 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 37.

The spelling of 20235916009 in words is "twenty billion, two hundred thirty-five million, nine hundred sixteen thousand, nine".