20020627781 has 16 divisors (see below), whose sum is σ = 25203130368. Its totient is φ = 15449022000.

The previous prime is 20020627747. The next prime is 20020627801. The reversal of 20020627781 is 18772602002.

It is a cyclic number.

It is not a de Polignac number, because 20020627781 - 2¹⁸ = 20020365637 is a prime.

It is a super-4 number, since 4×20020627781⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020627181) 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, 1254245 + ... + 1270106.

It is an arithmetic number, because the mean of its divisors is an integer number (1575195648).

Almost surely, 2^20020627781 is an apocalyptic number.

It is an amenable number.

20020627781 is a deficient number, since it is larger than the sum of its proper divisors (5182502587).

20020627781 is a wasteful number, since it uses less digits than its factorization.

20020627781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2524472.

The product of its (nonzero) digits is 18816, while the sum is 35.

The spelling of 20020627781 in words is "twenty billion, twenty million, six hundred twenty-seven thousand, seven hundred eighty-one".