20457245 has 8 divisors (see below), whose sum is σ = 24576216. Its totient is φ = 16347456.

The previous prime is 20457211. The next prime is 20457277. The reversal of 20457245 is 54275402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2699449 + 17757796 = 1643^2 + 4214^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20457245 - 2¹⁰ = 20456221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4379 + ... + 7751.

It is an arithmetic number, because the mean of its divisors is an integer number (3072027).

Almost surely, 2^20457245 is an apocalyptic number.

It is an amenable number.

20457245 is a deficient number, since it is larger than the sum of its proper divisors (4118971).

20457245 is a wasteful number, since it uses less digits than its factorization.

20457245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4591.

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 20457245 is about 4522.9686047993. The cubic root of 20457245 is about 273.4947844826.

It can be divided in two parts, 20457 and 245, that added together give a palindrome (20702).

The spelling of 20457245 in words is "twenty million, four hundred fifty-seven thousand, two hundred forty-five".