20413752997 has 4 divisors (see below), whose sum is σ = 22269548736. Its totient is φ = 18557957260.

The previous prime is 20413752977. The next prime is 20413753033. The reversal of 20413752997 is 79925731402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20413752997 - 2³¹ = 18266269349 is a prime.

It is a super-2 number, since 2×20413752997² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20413752997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20413752977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 927897853 + ... + 927897874.

It is an arithmetic number, because the mean of its divisors is an integer number (5567387184).

Almost surely, 2^20413752997 is an apocalyptic number.

It is an amenable number.

20413752997 is a deficient number, since it is larger than the sum of its proper divisors (1855795739).

20413752997 is a wasteful number, since it uses less digits than its factorization.

20413752997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855795738.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 20413752997 in words is "twenty billion, four hundred thirteen million, seven hundred fifty-two thousand, nine hundred ninety-seven".