20445627506 has 4 divisors (see below), whose sum is σ = 30668441262. Its totient is φ = 10222813752.

The previous prime is 20445627491. The next prime is 20445627523. The reversal of 20445627506 is 60572654402.

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., 14679503281 + 5766124225 = 121159^2 + 75935^2 .

It is a super-2 number, since 2×20445627506² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5111406875 + ... + 5111406878.

Almost surely, 2^20445627506 is an apocalyptic number.

20445627506 is a deficient number, since it is larger than the sum of its proper divisors (10222813756).

20445627506 is a wasteful number, since it uses less digits than its factorization.

20445627506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10222813755.

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 20445627506 in words is "twenty billion, four hundred forty-five million, six hundred twenty-seven thousand, five hundred six".