20723222529 has 6 divisors (see below), whose sum is σ = 29933543666. Its totient is φ = 13815481680.

The previous prime is 20723222503. The next prime is 20723222561. The reversal of 20723222529 is 92522232702.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11368464129 + 9354758400 = 106623^2 + 96720^2 .

It is not a de Polignac number, because 20723222529 - 2²³ = 20714833921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20723222493 and 20723222502.

It is not an unprimeable number, because it can be changed into a prime (20723222129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1151290132 + ... + 1151290149.

Almost surely, 2^20723222529 is an apocalyptic number.

It is an amenable number.

20723222529 is a deficient number, since it is larger than the sum of its proper divisors (9210321137).

20723222529 is a wasteful number, since it uses less digits than its factorization.

20723222529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302580287 (or 2302580284 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 20723222529 in words is "twenty billion, seven hundred twenty-three million, two hundred twenty-two thousand, five hundred twenty-nine".