20243457 has 12 divisors (see below), whose sum is σ = 31490004. Its totient is φ = 12457440.

The previous prime is 20243407. The next prime is 20243467. The reversal of 20243457 is 75434202.

20243457 is a `hidden beast` number, since 202 + 4 + 3 + 457 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6471936 + 13771521 = 2544^2 + 3711^2 .

It is not a de Polignac number, because 20243457 - 2¹⁰ = 20242433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20243457.

It is not an unprimeable number, because it can be changed into a prime (20243407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86394 + ... + 86627.

It is an arithmetic number, because the mean of its divisors is an integer number (2624167).

Almost surely, 2^20243457 is an apocalyptic number.

It is an amenable number.

20243457 is a deficient number, since it is larger than the sum of its proper divisors (11246547).

20243457 is a wasteful number, since it uses less digits than its factorization.

20243457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173040 (or 173037 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

The square root of 20243457 is about 4499.2729412651. The cubic root of 20243457 is about 272.5387291698.

Adding to 20243457 its reverse (75434202), we get a palindrome (95677659).

The spelling of 20243457 in words is "twenty million, two hundred forty-three thousand, four hundred fifty-seven".