20444629451 has 4 divisors (see below), whose sum is σ = 21520662600. Its totient is φ = 19368596304.

The previous prime is 20444629423. The next prime is 20444629483. The reversal of 20444629451 is 15492644402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20444629451 is a prime.

It is a super-2 number, since 2×20444629451² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20444629399 and 20444629408.

It is not an unprimeable number, because it can be changed into a prime (20444629151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538016546 + ... + 538016583.

It is an arithmetic number, because the mean of its divisors is an integer number (5380165650).

Almost surely, 2^20444629451 is an apocalyptic number.

20444629451 is a deficient number, since it is larger than the sum of its proper divisors (1076033149).

20444629451 is a wasteful number, since it uses less digits than its factorization.

20444629451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076033148.

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 20444629451 in words is "twenty billion, four hundred forty-four million, six hundred twenty-nine thousand, four hundred fifty-one".