20242440251 has 8 divisors (see below), whose sum is σ = 22092370608. Its totient is φ = 18394128000.

The previous prime is 20242440187. The next prime is 20242440287. The reversal of 20242440251 is 15204424202.

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 20242440251 - 2⁶ = 20242440187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20242440251.

It is not an unprimeable number, because it can be changed into a prime (20242440151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 378290 + ... + 428471.

It is an arithmetic number, because the mean of its divisors is an integer number (2761546326).

Almost surely, 2^20242440251 is an apocalyptic number.

20242440251 is a deficient number, since it is larger than the sum of its proper divisors (1849930357).

20242440251 is a wasteful number, since it uses less digits than its factorization.

20242440251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809053.

The product of its (nonzero) digits is 5120, while the sum is 26.

Adding to 20242440251 its reverse (15204424202), we get a palindrome (35446864453).

The spelling of 20242440251 in words is "twenty billion, two hundred forty-two million, four hundred forty thousand, two hundred fifty-one".