20440730507 has 4 divisors (see below), whose sum is σ = 20443890936. Its totient is φ = 20437570080.

The previous prime is 20440730503. The next prime is 20440730509. The reversal of 20440730507 is 70503704402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70503704402 = 2 ⋅35251852201.

It is a cyclic number.

It is not a de Polignac number, because 20440730507 - 2² = 20440730503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20440730503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1570493 + ... + 1583454.

It is an arithmetic number, because the mean of its divisors is an integer number (5110972734).

Almost surely, 2^20440730507 is an apocalyptic number.

20440730507 is a deficient number, since it is larger than the sum of its proper divisors (3160429).

20440730507 is an equidigital number, since it uses as much as digits as its factorization.

20440730507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160428.

The product of its (nonzero) digits is 23520, while the sum is 32.

The spelling of 20440730507 in words is "twenty billion, four hundred forty million, seven hundred thirty thousand, five hundred seven".