20981153417 has 4 divisors (see below), whose sum is σ = 23978461056. Its totient is φ = 17983845780.

The previous prime is 20981153411. The next prime is 20981153419. The reversal of 20981153417 is 71435118902.

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 20981153417 - 2¹⁰ = 20981152393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20981153411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1498653809 + ... + 1498653822.

It is an arithmetic number, because the mean of its divisors is an integer number (5994615264).

Almost surely, 2^20981153417 is an apocalyptic number.

It is an amenable number.

20981153417 is a deficient number, since it is larger than the sum of its proper divisors (2997307639).

20981153417 is an equidigital number, since it uses as much as digits as its factorization.

20981153417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2997307638.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 20981153417 in words is "twenty billion, nine hundred eighty-one million, one hundred fifty-three thousand, four hundred seventeen".