20515554226 has 4 divisors (see below), whose sum is σ = 30773331342. Its totient is φ = 10257777112.

The previous prime is 20515554203. The next prime is 20515554229. The reversal of 20515554226 is 62245551502.

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

It can be written as a sum of positive squares in only one way, i.e., 20473317225 + 42237001 = 143085^2 + 6499^2 .

It is not an unprimeable number, because it can be changed into a prime (20515554229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5128888555 + ... + 5128888558.

Almost surely, 2^20515554226 is an apocalyptic number.

20515554226 is a deficient number, since it is larger than the sum of its proper divisors (10257777116).

20515554226 is a wasteful number, since it uses less digits than its factorization.

20515554226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10257777115.

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 20515554226 in words is "twenty billion, five hundred fifteen million, five hundred fifty-four thousand, two hundred twenty-six".