20734457 has 4 divisors (see below), whose sum is σ = 20765940. Its totient is φ = 20702976.

The previous prime is 20734451. The next prime is 20734463. The reversal of 20734457 is 75443702.

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

It is an interprime number because it is at equal distance from previous prime (20734451) and next prime (20734463).

It can be written as a sum of positive squares in 2 ways, for example, as 12503296 + 8231161 = 3536^2 + 2869^2 .

It is a cyclic number.

It is not a de Polignac number, because 20734457 - 2¹⁴ = 20718073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20734451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14732 + ... + 16077.

It is an arithmetic number, because the mean of its divisors is an integer number (5191485).

Almost surely, 2^20734457 is an apocalyptic number.

It is an amenable number.

20734457 is a deficient number, since it is larger than the sum of its proper divisors (31483).

20734457 is an equidigital number, since it uses as much as digits as its factorization.

20734457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31482.

The product of its (nonzero) digits is 23520, while the sum is 32.

The square root of 20734457 is about 4553.5104040729. The cubic root of 20734457 is about 274.7246036376.

The spelling of 20734457 in words is "twenty million, seven hundred thirty-four thousand, four hundred fifty-seven".