20552140251 has 6 divisors (see below), whose sum is σ = 29686424820. Its totient is φ = 13701426828.

The previous prime is 20552140183. The next prime is 20552140303. The reversal of 20552140251 is 15204125502.

20552140251 is a `hidden beast` number, since 20 + 552 + 1 + 40 + 2 + 51 = 666.

It is not a de Polignac number, because 20552140251 - 2¹⁸ = 20551878107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20552140451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1141785561 + ... + 1141785578.

It is an arithmetic number, because the mean of its divisors is an integer number (4947737470).

Almost surely, 2^20552140251 is an apocalyptic number.

20552140251 is a deficient number, since it is larger than the sum of its proper divisors (9134284569).

20552140251 is a wasteful number, since it uses less digits than its factorization.

20552140251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283571145 (or 2283571142 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 20552140251 its reverse (15204125502), we get a palindrome (35756265753).

The spelling of 20552140251 in words is "twenty billion, five hundred fifty-two million, one hundred forty thousand, two hundred fifty-one".