20074777531 has 4 divisors (see below), whose sum is σ = 20075659864. Its totient is φ = 20073895200.

The previous prime is 20074777529. The next prime is 20074777543. The reversal of 20074777531 is 13577747002.

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

It is a cyclic number.

It is not a de Polignac number, because 20074777531 - 2¹ = 20074777529 is a prime.

It is a super-2 number, since 2×20074777531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20074777031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406110 + ... + 452851.

It is an arithmetic number, because the mean of its divisors is an integer number (5018914966).

Almost surely, 2^20074777531 is an apocalyptic number.

20074777531 is a deficient number, since it is larger than the sum of its proper divisors (882333).

20074777531 is an equidigital number, since it uses as much as digits as its factorization.

20074777531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882332.

The product of its (nonzero) digits is 288120, while the sum is 43.

The spelling of 20074777531 in words is "twenty billion, seventy-four million, seven hundred seventy-seven thousand, five hundred thirty-one".