20369643 has 12 divisors (see below), whose sum is σ = 31593960. Its totient is φ = 11639712.

The previous prime is 20369639. The next prime is 20369677. The reversal of 20369643 is 34696302.

It is not a de Polignac number, because 20369643 - 2² = 20369639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20369623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69138 + ... + 69431.

It is an arithmetic number, because the mean of its divisors is an integer number (2632830).

Almost surely, 2^20369643 is an apocalyptic number.

20369643 is a deficient number, since it is larger than the sum of its proper divisors (11224317).

20369643 is a wasteful number, since it uses less digits than its factorization.

20369643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138586 (or 138579 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 20369643 is about 4513.2740887298. The cubic root of 20369643 is about 273.1038395251.

It can be divided in two parts, 20369 and 643, that added together give a palindrome (21012).

The spelling of 20369643 in words is "twenty million, three hundred sixty-nine thousand, six hundred forty-three".