20726245209 has 32 divisors (see below), whose sum is σ = 29314512000. Its totient is φ = 12989389824.

The previous prime is 20726245153. The next prime is 20726245223. The reversal of 20726245209 is 90254262702.

It is not a de Polignac number, because 20726245209 - 2¹⁹ = 20725720921 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20726245259) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4135297 + ... + 4140305.

It is an arithmetic number, because the mean of its divisors is an integer number (916078500).

Almost surely, 2^20726245209 is an apocalyptic number.

It is an amenable number.

20726245209 is a deficient number, since it is larger than the sum of its proper divisors (8588266791).

20726245209 is a wasteful number, since it uses less digits than its factorization.

20726245209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5577.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 20726245209 in words is "twenty billion, seven hundred twenty-six million, two hundred forty-five thousand, two hundred nine".