20723222501 has 4 divisors (see below), whose sum is σ = 21205157952. Its totient is φ = 20241287052.

The previous prime is 20723222431. The next prime is 20723222503. The reversal of 20723222501 is 10522232702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20723222501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20723222503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240967661 + ... + 240967746.

It is an arithmetic number, because the mean of its divisors is an integer number (5301289488).

Almost surely, 2^20723222501 is an apocalyptic number.

It is an amenable number.

20723222501 is a deficient number, since it is larger than the sum of its proper divisors (481935451).

20723222501 is an equidigital number, since it uses as much as digits as its factorization.

20723222501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481935450.

The product of its (nonzero) digits is 3360, while the sum is 26.

The spelling of 20723222501 in words is "twenty billion, seven hundred twenty-three million, two hundred twenty-two thousand, five hundred one".