20408392249 has 6 divisors (see below), whose sum is σ = 23740374714. Its totient is φ = 17492907600.

The previous prime is 20408392243. The next prime is 20408392259. The reversal of 20408392249 is 94229380402.

It can be written as a sum of positive squares in only one way, i.e., 16813790224 + 3594602025 = 129668^2 + 59955^2 .

It is not a de Polignac number, because 20408392249 - 2¹³ = 20408384057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20408392243) 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 5 ways as a sum of consecutive naturals, for example, 208248852 + ... + 208248949.

It is an arithmetic number, because the mean of its divisors is an integer number (3956729119).

Almost surely, 2^20408392249 is an apocalyptic number.

It is an amenable number.

20408392249 is a deficient number, since it is larger than the sum of its proper divisors (3331982465).

20408392249 is an equidigital number, since it uses as much as digits as its factorization.

20408392249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416497815 (or 416497808 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 20408392249 in words is "twenty billion, four hundred eight million, three hundred ninety-two thousand, two hundred forty-nine".