20402001297 has 12 divisors (see below), whose sum is σ = 29536085904. Its totient is φ = 13570628760.

The previous prime is 20402001293. The next prime is 20402001307. The reversal of 20402001297 is 79210020402.

It is not a de Polignac number, because 20402001297 - 2² = 20402001293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20402001297.

It is not an unprimeable number, because it can be changed into a prime (20402001293) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2554579 + ... + 2562552.

It is an arithmetic number, because the mean of its divisors is an integer number (2461340492).

Almost surely, 2^20402001297 is an apocalyptic number.

It is an amenable number.

20402001297 is a deficient number, since it is larger than the sum of its proper divisors (9134084607).

20402001297 is a wasteful number, since it uses less digits than its factorization.

20402001297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5117580 (or 5117577 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

Adding to 20402001297 its reverse (79210020402), we get a palindrome (99612021699).

The spelling of 20402001297 in words is "twenty billion, four hundred two million, one thousand, two hundred ninety-seven".