20240002251 has 20 divisors (see below), whose sum is σ = 34554361072. Its totient is φ = 11565715248.

The previous prime is 20240002247. The next prime is 20240002283. The reversal of 20240002251 is 15220004202.

It is not a de Polignac number, because 20240002251 - 2² = 20240002247 is a prime.

It is a super-2 number, since 2×20240002251² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20240002201) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17847760 + ... + 17848893.

Almost surely, 2^20240002251 is an apocalyptic number.

20240002251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20240002251 is a deficient number, since it is larger than the sum of its proper divisors (14314358821).

20240002251 is an equidigital number, since it uses as much as digits as its factorization.

20240002251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35696672 (or 35696663 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

Adding to 20240002251 its reverse (15220004202), we get a palindrome (35460006453).

The spelling of 20240002251 in words is "twenty billion, two hundred forty million, two thousand, two hundred fifty-one".