20672438061 has 16 divisors (see below), whose sum is σ = 30188809728. Its totient is φ = 12478830000.

The previous prime is 20672438051. The next prime is 20672438063. The reversal of 20672438061 is 16083427602.

It is a happy number.

It is not a de Polignac number, because 20672438061 - 2⁶ = 20672437997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20672438063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1239601 + ... + 1256166.

It is an arithmetic number, because the mean of its divisors is an integer number (1886800608).

Almost surely, 2^20672438061 is an apocalyptic number.

It is an amenable number.

20672438061 is a deficient number, since it is larger than the sum of its proper divisors (9516371667).

20672438061 is a wasteful number, since it uses less digits than its factorization.

20672438061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496032.

The product of its (nonzero) digits is 96768, while the sum is 39.

The spelling of 20672438061 in words is "twenty billion, six hundred seventy-two million, four hundred thirty-eight thousand, sixty-one".