20455191390 has 16 divisors (see below), whose sum is σ = 49092459408. Its totient is φ = 5454717696.

The previous prime is 20455191389. The next prime is 20455191397. The reversal of 20455191390 is 9319155402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20455191397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340919827 + ... + 340919886.

It is an arithmetic number, because the mean of its divisors is an integer number (3068278713).

Almost surely, 2^20455191390 is an apocalyptic number.

20455191390 is an abundant number, since it is smaller than the sum of its proper divisors (28637268018).

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

20455191390 is a wasteful number, since it uses less digits than its factorization.

20455191390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681839723.

The product of its (nonzero) digits is 48600, while the sum is 39.

The spelling of 20455191390 in words is "twenty billion, four hundred fifty-five million, one hundred ninety-one thousand, three hundred ninety".