20837142781 has 8 divisors (see below), whose sum is σ = 25645714304. Its totient is φ = 16486530480.

The previous prime is 20837142757. The next prime is 20837142787. The reversal of 20837142781 is 18724173802.

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

It is not a de Polignac number, because 20837142781 - 2¹³ = 20837134589 is a prime.

It is a super-2 number, since 2×20837142781² (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 (20837142787) 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, 114489705 + ... + 114489886.

It is an arithmetic number, because the mean of its divisors is an integer number (3205714288).

Almost surely, 2^20837142781 is an apocalyptic number.

It is an amenable number.

20837142781 is a deficient number, since it is larger than the sum of its proper divisors (4808571523).

20837142781 is a wasteful number, since it uses less digits than its factorization.

20837142781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228979611.

The product of its (nonzero) digits is 150528, while the sum is 43.

It can be divided in two parts, 208371 and 42781, that added together give a palindrome (251152).

The spelling of 20837142781 in words is "twenty billion, eight hundred thirty-seven million, one hundred forty-two thousand, seven hundred eighty-one".