20001251897 has 16 divisors (see below), whose sum is σ = 22504483584. Its totient is φ = 17619840000.

The previous prime is 20001251891. The next prime is 20001251953. The reversal of 20001251897 is 79815210002.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001251897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20001251891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139304 + ... + 243737.

It is an arithmetic number, because the mean of its divisors is an integer number (1406530224).

Almost surely, 2^20001251897 is an apocalyptic number.

It is an amenable number.

20001251897 is a deficient number, since it is larger than the sum of its proper divisors (2503231687).

20001251897 is a wasteful number, since it uses less digits than its factorization.

20001251897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383200.

The product of its (nonzero) digits is 10080, while the sum is 35.

Adding to 20001251897 its reverse (79815210002), we get a palindrome (99816461899).

The spelling of 20001251897 in words is "twenty billion, one million, two hundred fifty-one thousand, eight hundred ninety-seven".