20320661031 has 16 divisors (see below), whose sum is σ = 29560165248. Its totient is φ = 12314368800.

The previous prime is 20320661029. The next prime is 20320661057. The reversal of 20320661031 is 13016602302.

It is a happy number.

It is not a de Polignac number, because 20320661031 - 2¹ = 20320661029 is a prime.

It is a super-2 number, since 2×20320661031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20320660992 and 20320661010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320661071) 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 15 ways as a sum of consecutive naturals, for example, 421896 + ... + 467586.

It is an arithmetic number, because the mean of its divisors is an integer number (1847510328).

Almost surely, 2^20320661031 is an apocalyptic number.

20320661031 is a deficient number, since it is larger than the sum of its proper divisors (9239504217).

20320661031 is a wasteful number, since it uses less digits than its factorization.

20320661031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59182.

The product of its (nonzero) digits is 1296, while the sum is 24.

The spelling of 20320661031 in words is "twenty billion, three hundred twenty million, six hundred sixty-one thousand, thirty-one".