20041025251 has 16 divisors (see below), whose sum is σ = 21910392000. Its totient is φ = 18220105728.

The previous prime is 20041025243. The next prime is 20041025281. The reversal of 20041025251 is 15252014002.

It is a cyclic number.

It is not a de Polignac number, because 20041025251 - 2³ = 20041025243 is a prime.

It is a super-2 number, since 2×20041025251² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20041025281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263650 + ... + 331048.

It is an arithmetic number, because the mean of its divisors is an integer number (1369399500).

Almost surely, 2^20041025251 is an apocalyptic number.

20041025251 is a deficient number, since it is larger than the sum of its proper divisors (1869366749).

20041025251 is a wasteful number, since it uses less digits than its factorization.

20041025251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67758.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 20041025251 its reverse (15252014002), we get a palindrome (35293039253).

The spelling of 20041025251 in words is "twenty billion, forty-one million, twenty-five thousand, two hundred fifty-one".