20861841037 has 4 divisors (see below), whose sum is σ = 21155669856. Its totient is φ = 20568012220.

The previous prime is 20861841029. The next prime is 20861841043. The reversal of 20861841037 is 73014816802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73014816802 = 2 ⋅36507408401.

It is a cyclic number.

It is not a de Polignac number, because 20861841037 - 2³ = 20861841029 is a prime.

It is a super-2 number, since 2×20861841037² (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 (20861841047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146914303 + ... + 146914444.

It is an arithmetic number, because the mean of its divisors is an integer number (5288917464).

Almost surely, 2^20861841037 is an apocalyptic number.

It is an amenable number.

20861841037 is a deficient number, since it is larger than the sum of its proper divisors (293828819).

20861841037 is an equidigital number, since it uses as much as digits as its factorization.

20861841037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293828818.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 20861841037 in words is "twenty billion, eight hundred sixty-one million, eight hundred forty-one thousand, thirty-seven".