20512144251 has 24 divisors (see below), whose sum is σ = 30658829760. Its totient is φ = 13199558400.

The previous prime is 20512144243. The next prime is 20512144267. The reversal of 20512144251 is 15244121502.

It is a happy number.

20512144251 is a `hidden beast` number, since 2 + 0 + 512 + 144 + 2 + 5 + 1 = 666.

It is not a de Polignac number, because 20512144251 - 2³ = 20512144243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20512144271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1181806 + ... + 1199036.

It is an arithmetic number, because the mean of its divisors is an integer number (1277451240).

Almost surely, 2^20512144251 is an apocalyptic number.

20512144251 is a deficient number, since it is larger than the sum of its proper divisors (10146685509).

20512144251 is a wasteful number, since it uses less digits than its factorization.

20512144251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21827 (or 21824 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 20512144251 its reverse (15244121502), we get a palindrome (35756265753).

The spelling of 20512144251 in words is "twenty billion, five hundred twelve million, one hundred forty-four thousand, two hundred fifty-one".