20502543405 has 64 divisors (see below), whose sum is σ = 35595141120. Its totient is φ = 10036970496.

The previous prime is 20502543401. The next prime is 20502543421. The reversal of 20502543405 is 50434520502.

It is not a de Polignac number, because 20502543405 - 2² = 20502543401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20502543401) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11654916 + ... + 11656674.

It is an arithmetic number, because the mean of its divisors is an integer number (556174080).

Almost surely, 2^20502543405 is an apocalyptic number.

It is an amenable number.

20502543405 is a deficient number, since it is larger than the sum of its proper divisors (15092597715).

20502543405 is a wasteful number, since it uses less digits than its factorization.

20502543405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890.

The product of its (nonzero) digits is 24000, while the sum is 30.

The spelling of 20502543405 in words is "twenty billion, five hundred two million, five hundred forty-three thousand, four hundred five".