20111958 has 24 divisors (see below), whose sum is σ = 44504928. Its totient is φ = 6561072.

The previous prime is 20111947. The next prime is 20111981. The reversal of 20111958 is 85911102.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11041 + ... + 12732.

It is an arithmetic number, because the mean of its divisors is an integer number (1854372).

Almost surely, 2^20111958 is an apocalyptic number.

20111958 is an abundant number, since it is smaller than the sum of its proper divisors (24392970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111958 is a wasteful number, since it uses less digits than its factorization.

20111958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23828 (or 23825 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 20111958 is about 4484.6357711636. The cubic root of 20111958 is about 271.9473207525.

It can be divided in two parts, 2011 and 1958, that added together give a square (3969 = 63²).

The spelling of 20111958 in words is "twenty million, one hundred eleven thousand, nine hundred fifty-eight".