20774829581 has 8 divisors (see below), whose sum is σ = 22665334464. Its totient is φ = 18884638720.

The previous prime is 20774829541. The next prime is 20774829587. The reversal of 20774829581 is 18592847702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20774829581 - 2¹⁴ = 20774813197 is a prime.

It is a super-2 number, since 2×20774829581² (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 (20774829587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72461 + ... + 216333.

It is an arithmetic number, because the mean of its divisors is an integer number (2833166808).

Almost surely, 2^20774829581 is an apocalyptic number.

It is an amenable number.

20774829581 is a deficient number, since it is larger than the sum of its proper divisors (1890504883).

20774829581 is a wasteful number, since it uses less digits than its factorization.

20774829581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157011.

The product of its (nonzero) digits is 2257920, while the sum is 53.

The spelling of 20774829581 in words is "twenty billion, seven hundred seventy-four million, eight hundred twenty-nine thousand, five hundred eighty-one".