20723453 has 2 divisors, whose sum is σ = 20723454. Its totient is φ = 20723452.

The previous prime is 20723449. The next prime is 20723473. The reversal of 20723453 is 35432702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13557124 + 7166329 = 3682^2 + 2677^2 .

It is a cyclic number.

It is not a de Polignac number, because 20723453 - 2² = 20723449 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20723413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10361726 + 10361727.

It is an arithmetic number, because the mean of its divisors is an integer number (10361727).

Almost surely, 2^20723453 is an apocalyptic number.

It is an amenable number.

20723453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20723453 is an equidigital number, since it uses as much as digits as its factorization.

20723453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 26.

The square root of 20723453 is about 4552.3019451702. The cubic root of 20723453 is about 274.6759952674.

The spelling of 20723453 in words is "twenty million, seven hundred twenty-three thousand, four hundred fifty-three".