20651653131 has 4 divisors (see below), whose sum is σ = 27535537512. Its totient is φ = 13767768752.

The previous prime is 20651653081. The next prime is 20651653133. The reversal of 20651653131 is 13135615602.

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 20651653131 - 2¹⁸ = 20651390987 is a prime.

It is a super-2 number, since 2×20651653131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20651653092 and 20651653101.

It is not an unprimeable number, because it can be changed into a prime (20651653133) 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, 3441942186 + ... + 3441942191.

It is an arithmetic number, because the mean of its divisors is an integer number (6883884378).

Almost surely, 2^20651653131 is an apocalyptic number.

20651653131 is a deficient number, since it is larger than the sum of its proper divisors (6883884381).

20651653131 is an equidigital number, since it uses as much as digits as its factorization.

20651653131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6883884380.

The product of its (nonzero) digits is 16200, while the sum is 33.

The spelling of 20651653131 in words is "twenty billion, six hundred fifty-one million, six hundred fifty-three thousand, one hundred thirty-one".