20451562546 has 8 divisors (see below), whose sum is σ = 30744472860. Its totient is φ = 10203404928.

The previous prime is 20451562531. The next prime is 20451562553. The reversal of 20451562546 is 64526515402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18120121321 + 2331441225 = 134611^2 + 48285^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20451562499 and 20451562508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11187031 + ... + 11188858.

Almost surely, 2^20451562546 is an apocalyptic number.

20451562546 is a deficient number, since it is larger than the sum of its proper divisors (10292910314).

20451562546 is a wasteful number, since it uses less digits than its factorization.

20451562546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22376348.

The product of its (nonzero) digits is 288000, while the sum is 40.

The spelling of 20451562546 in words is "twenty billion, four hundred fifty-one million, five hundred sixty-two thousand, five hundred forty-six".