20512205458 has 4 divisors (see below), whose sum is σ = 30768308190. Its totient is φ = 10256102728.

The previous prime is 20512205429. The next prime is 20512205471. The reversal of 20512205458 is 85450221502.

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., 16474492609 + 4037712849 = 128353^2 + 63543^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5128051363 + ... + 5128051366.

Almost surely, 2^20512205458 is an apocalyptic number.

20512205458 is a deficient number, since it is larger than the sum of its proper divisors (10256102732).

20512205458 is a wasteful number, since it uses less digits than its factorization.

20512205458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10256102731.

The product of its (nonzero) digits is 32000, while the sum is 34.

The spelling of 20512205458 in words is "twenty billion, five hundred twelve million, two hundred five thousand, four hundred fifty-eight".