20021087607049 has 3 divisors (see below), whose sum is σ = 20021092081543. Its totient is φ = 20021083132556.

The previous prime is 20021087607011. The next prime is 20021087607107. The reversal of 20021087607049 is 94070678012002.

The square root of 20021087607049 is 4474493.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 12542328495225 + 7478759111824 = 3541515^2 + 2734732^2 .

It is not a de Polignac number, because 20021087607049 - 2²⁷ = 20020953389321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021087602049) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2237247 + ... + 6711739.

Almost surely, 2^{20021087607049} is an apocalyptic number.

20021087607049 is the 4474493-rd square number.

20021087607049 is the 2237247-th centered octagonal number.

It is an amenable number.

20021087607049 is a deficient number, since it is larger than the sum of its proper divisors (4474494).

20021087607049 is an frugal number, since it uses more digits than its factorization.

20021087607049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8948986 (or 4474493 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 20021087607049 in words is "twenty trillion, twenty-one billion, eighty-seven million, six hundred seven thousand, forty-nine".