20045033781 has 16 divisors (see below), whose sum is σ = 27031713600. Its totient is φ = 13211251200.

The previous prime is 20045033777. The next prime is 20045033809. The reversal of 20045033781 is 18733054002.

It is not a de Polignac number, because 20045033781 - 2² = 20045033777 is a prime.

It is a super-2 number, since 2×20045033781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045037781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154770 + ... + 253068.

It is an arithmetic number, because the mean of its divisors is an integer number (1689482100).

Almost surely, 2^20045033781 is an apocalyptic number.

It is an amenable number.

20045033781 is a deficient number, since it is larger than the sum of its proper divisors (6986679819).

20045033781 is a wasteful number, since it uses less digits than its factorization.

20045033781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99076.

The product of its (nonzero) digits is 20160, while the sum is 33.

Adding to 20045033781 its reverse (18733054002), we get a palindrome (38778087783).

The spelling of 20045033781 in words is "twenty billion, forty-five million, thirty-three thousand, seven hundred eighty-one".