20436232281 has 16 divisors (see below), whose sum is σ = 27393883200. Its totient is φ = 13551484608.

The previous prime is 20436232213. The next prime is 20436232303. The reversal of 20436232281 is 18223263402.

It is not a de Polignac number, because 20436232281 - 2¹³ = 20436224089 is a prime.

It is a super-2 number, since 2×20436232281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20436231281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 720490 + ... + 748316.

It is an arithmetic number, because the mean of its divisors is an integer number (1712117700).

Almost surely, 2^20436232281 is an apocalyptic number.

It is an amenable number.

20436232281 is a deficient number, since it is larger than the sum of its proper divisors (6957650919).

20436232281 is a wasteful number, since it uses less digits than its factorization.

20436232281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29128.

The product of its (nonzero) digits is 27648, while the sum is 33.

Adding to 20436232281 its reverse (18223263402), we get a palindrome (38659495683).

The spelling of 20436232281 in words is "twenty billion, four hundred thirty-six million, two hundred thirty-two thousand, two hundred eighty-one".