20190390852 has 12 divisors (see below), whose sum is σ = 47110912016. Its totient is φ = 6730130280.

The previous prime is 20190390841. The next prime is 20190390853. The reversal of 20190390852 is 25809309102.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20190390852.

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 3 ways as a sum of consecutive naturals, for example, 841266274 + ... + 841266297.

Almost surely, 2^20190390852 is an apocalyptic number.

It is an amenable number.

20190390852 is an abundant number, since it is smaller than the sum of its proper divisors (26920521164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20190390852 is a wasteful number, since it uses less digits than its factorization.

20190390852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682532578 (or 1682532576 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

Adding to 20190390852 its reverse (25809309102), we get a palindrome (45999699954).

The spelling of 20190390852 in words is "twenty billion, one hundred ninety million, three hundred ninety thousand, eight hundred fifty-two".