20190390855 has 16 divisors (see below), whose sum is σ = 32307124704. Its totient is φ = 10767375360.

The previous prime is 20190390853. The next prime is 20190390859. The reversal of 20190390855 is 55809309102.

It is not a de Polignac number, because 20190390855 - 2¹ = 20190390853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20190390853) 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, 182307 + ... + 271323.

It is an arithmetic number, because the mean of its divisors is an integer number (2019195294).

Almost surely, 2^20190390855 is an apocalyptic number.

20190390855 is a deficient number, since it is larger than the sum of its proper divisors (12116733849).

20190390855 is a wasteful number, since it uses less digits than its factorization.

20190390855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104146.

The product of its (nonzero) digits is 97200, while the sum is 42.

Adding to 20190390855 its reverse (55809309102), we get a palindrome (75999699957).

The spelling of 20190390855 in words is "twenty billion, one hundred ninety million, three hundred ninety thousand, eight hundred fifty-five".