20628852506 has 8 divisors (see below), whose sum is σ = 31122142164. Its totient is φ = 10254805120.

The previous prime is 20628852499. The next prime is 20628852511. The reversal of 20628852506 is 60525882602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20159740225 + 469112281 = 141985^2 + 21659^2 .

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

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, 29810135 + ... + 29810826.

Almost surely, 2^20628852506 is an apocalyptic number.

20628852506 is a deficient number, since it is larger than the sum of its proper divisors (10493289658).

20628852506 is a wasteful number, since it uses less digits than its factorization.

20628852506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59621136.

The product of its (nonzero) digits is 460800, while the sum is 44.

The spelling of 20628852506 in words is "twenty billion, six hundred twenty-eight million, eight hundred fifty-two thousand, five hundred six".