20440072451 has 8 divisors (see below), whose sum is σ = 21677746464. Its totient is φ = 19206322560.

The previous prime is 20440072421. The next prime is 20440072463. The reversal of 20440072451 is 15427004402.

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

It is not a de Polignac number, because 20440072451 - 2¹⁴ = 20440056067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20440072421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 970295 + ... + 991136.

It is an arithmetic number, because the mean of its divisors is an integer number (2709718308).

Almost surely, 2^20440072451 is an apocalyptic number.

20440072451 is a deficient number, since it is larger than the sum of its proper divisors (1237674013).

20440072451 is a wasteful number, since it uses less digits than its factorization.

20440072451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962061.

The product of its (nonzero) digits is 8960, while the sum is 29.

Adding to 20440072451 its reverse (15427004402), we get a palindrome (35867076853).

The spelling of 20440072451 in words is "twenty billion, four hundred forty million, seventy-two thousand, four hundred fifty-one".