20504821990 has 8 divisors (see below), whose sum is σ = 36908679600. Its totient is φ = 8201928792.

The previous prime is 20504821979. The next prime is 20504822047. The reversal of 20504821990 is 9912840502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1025241090 + ... + 1025241109.

It is an arithmetic number, because the mean of its divisors is an integer number (4613584950).

Almost surely, 2^20504821990 is an apocalyptic number.

20504821990 is a deficient number, since it is larger than the sum of its proper divisors (16403857610).

20504821990 is a wasteful number, since it uses less digits than its factorization.

20504821990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050482206.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 20504821990 in words is "twenty billion, five hundred four million, eight hundred twenty-one thousand, nine hundred ninety".