20515552042550 has 12 divisors (see below), whose sum is σ = 38158926799236. Its totient is φ = 8206220817000.

The previous prime is 20515552042529. The next prime is 20515552042561. The reversal of 20515552042550 is 5524025551502.

It is a super-2 number, since 2×20515552042550² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20515552042498 and 20515552042507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 205155520376 + ... + 205155520475.

It is an arithmetic number, because the mean of its divisors is an integer number (3179910566603).

Almost surely, 2^{20515552042550} is an apocalyptic number.

20515552042550 is a deficient number, since it is larger than the sum of its proper divisors (17643374756686).

20515552042550 is a wasteful number, since it uses less digits than its factorization.

20515552042550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410311040863 (or 410311040858 counting only the distinct ones).

The product of its (nonzero) digits is 500000, while the sum is 41.

The spelling of 20515552042550 in words is "twenty trillion, five hundred fifteen billion, five hundred fifty-two million, forty-two thousand, five hundred fifty".