20267236949 has 4 divisors (see below), whose sum is σ = 20268395820. Its totient is φ = 20266078080.

The previous prime is 20267236943. The next prime is 20267236963. The reversal of 20267236949 is 94963276202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3885028900 + 16382208049 = 62330^2 + 127993^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20267236949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20267236897 and 20267236906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20267236943) 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, 552794 + ... + 588315.

It is an arithmetic number, because the mean of its divisors is an integer number (5067098955).

Almost surely, 2^20267236949 is an apocalyptic number.

It is an amenable number.

20267236949 is a deficient number, since it is larger than the sum of its proper divisors (1158871).

20267236949 is a wasteful number, since it uses less digits than its factorization.

20267236949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158870.

The product of its (nonzero) digits is 1959552, while the sum is 50.

The spelling of 20267236949 in words is "twenty billion, two hundred sixty-seven million, two hundred thirty-six thousand, nine hundred forty-nine".