20954773861 has 16 divisors (see below), whose sum is σ = 24818256000. Its totient is φ = 17310984768.

The previous prime is 20954773859. The next prime is 20954773867. The reversal of 20954773861 is 16837745902.

It is not a de Polignac number, because 20954773861 - 2¹ = 20954773859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20954773799 and 20954773808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20954773867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22615 + ... + 205963.

It is an arithmetic number, because the mean of its divisors is an integer number (1551141000).

It is a 1-persistent number, because it is pandigital, but 2⋅20954773861 = 41909547722 is not.

Almost surely, 2^20954773861 is an apocalyptic number.

It is an amenable number.

20954773861 is a deficient number, since it is larger than the sum of its proper divisors (3863482139).

20954773861 is a wasteful number, since it uses less digits than its factorization.

20954773861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183948.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 20954773861 in words is "twenty billion, nine hundred fifty-four million, seven hundred seventy-three thousand, eight hundred sixty-one".