20453632949 has 2 divisors, whose sum is σ = 20453632950. Its totient is φ = 20453632948.

The previous prime is 20453632931. The next prime is 20453632961. The reversal of 20453632949 is 94923635402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20257828900 + 195804049 = 142330^2 + 13993^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20453632949 is a prime.

It is a super-2 number, since 2×20453632949² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20453637949) 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 as a sum of consecutive naturals, namely, 10226816474 + 10226816475.

It is an arithmetic number, because the mean of its divisors is an integer number (10226816475).

Almost surely, 2^20453632949 is an apocalyptic number.

It is an amenable number.

20453632949 is a deficient number, since it is larger than the sum of its proper divisors (1).

20453632949 is an equidigital number, since it uses as much as digits as its factorization.

20453632949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 47.

The spelling of 20453632949 in words is "twenty billion, four hundred fifty-three million, six hundred thirty-two thousand, nine hundred forty-nine".