24420157 has 4 divisors (see below), whose sum is σ = 25207936. Its totient is φ = 23632380.

The previous prime is 24420139. The next prime is 24420203. The reversal of 24420157 is 75102442.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75102442 = 2 ⋅37551221.

It is a cyclic number.

It is not a de Polignac number, because 24420157 - 2¹⁹ = 23895869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24420127) 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, 393843 + ... + 393904.

It is an arithmetic number, because the mean of its divisors is an integer number (6301984).

Almost surely, 2^24420157 is an apocalyptic number.

It is an amenable number.

24420157 is a deficient number, since it is larger than the sum of its proper divisors (787779).

24420157 is an equidigital number, since it uses as much as digits as its factorization.

24420157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787778.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 24420157 is about 4941.6755255682. The cubic root of 24420157 is about 290.1234393250.

Adding to 24420157 its reverse (75102442), we get a palindrome (99522599).

The spelling of 24420157 in words is "twenty-four million, four hundred twenty thousand, one hundred fifty-seven".