20504550385 has 32 divisors (see below), whose sum is σ = 27575976960. Its totient is φ = 14506905600.

The previous prime is 20504550383. The next prime is 20504550403. The reversal of 20504550385 is 58305540502.

It is a happy number.

It is not a de Polignac number, because 20504550385 - 2¹ = 20504550383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20504550383) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 783136 + ... + 808894.

It is an arithmetic number, because the mean of its divisors is an integer number (861749280).

Almost surely, 2^20504550385 is an apocalyptic number.

It is an amenable number.

20504550385 is a deficient number, since it is larger than the sum of its proper divisors (7071426575).

20504550385 is a wasteful number, since it uses less digits than its factorization.

20504550385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26169.

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 20504550385 in words is "twenty billion, five hundred four million, five hundred fifty thousand, three hundred eighty-five".