20274115991 has 4 divisors (see below), whose sum is σ = 20287535184. Its totient is φ = 20260696800.

The previous prime is 20274115987. The next prime is 20274116011. The reversal of 20274115991 is 19951147202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20274115991 - 2² = 20274115987 is a prime.

It is a super-2 number, since 2×20274115991² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20274115951) 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, 6707330 + ... + 6710351.

It is an arithmetic number, because the mean of its divisors is an integer number (5071883796).

Almost surely, 2^20274115991 is an apocalyptic number.

20274115991 is a deficient number, since it is larger than the sum of its proper divisors (13419193).

20274115991 is a wasteful number, since it uses less digits than its factorization.

20274115991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13419192.

The product of its (nonzero) digits is 45360, while the sum is 41.

The spelling of 20274115991 in words is "twenty billion, two hundred seventy-four million, one hundred fifteen thousand, nine hundred ninety-one".