20205020854 has 4 divisors (see below), whose sum is σ = 30307531284. Its totient is φ = 10102510426.

The previous prime is 20205020851. The next prime is 20205020893. The reversal of 20205020854 is 45802050202.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205020851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5051255212 + ... + 5051255215.

It is an arithmetic number, because the mean of its divisors is an integer number (7576882821).

Almost surely, 2^20205020854 is an apocalyptic number.

20205020854 is a deficient number, since it is larger than the sum of its proper divisors (10102510430).

20205020854 is a wasteful number, since it uses less digits than its factorization.

20205020854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10102510429.

The product of its (nonzero) digits is 6400, while the sum is 28.

The spelling of 20205020854 in words is "twenty billion, two hundred five million, twenty thousand, eight hundred fifty-four".