20149453 has 2 divisors, whose sum is σ = 20149454. Its totient is φ = 20149452.

The previous prime is 20149447. The next prime is 20149457. The reversal of 20149453 is 35494102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19954089 + 195364 = 4467^2 + 442^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20149453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20149457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10074726 + 10074727.

It is an arithmetic number, because the mean of its divisors is an integer number (10074727).

Almost surely, 2^20149453 is an apocalyptic number.

It is an amenable number.

20149453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20149453 is an equidigital number, since it uses as much as digits as its factorization.

20149453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20149453 is about 4488.8142086747. The cubic root of 20149453 is about 272.1162142163.

It can be divided in two parts, 20149 and 453, that added together give a palindrome (20602).

The spelling of 20149453 in words is "twenty million, one hundred forty-nine thousand, four hundred fifty-three".