20513958 has 16 divisors (see below), whose sum is σ = 43187520. Its totient is φ = 6478056.

The previous prime is 20513921. The next prime is 20513963. The reversal of 20513958 is 85931502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89860 + ... + 90087.

It is an arithmetic number, because the mean of its divisors is an integer number (2699220).

Almost surely, 2^20513958 is an apocalyptic number.

20513958 is an abundant number, since it is smaller than the sum of its proper divisors (22673562).

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

20513958 is a wasteful number, since it uses less digits than its factorization.

20513958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179971.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 20513958 is about 4529.2337100220. The cubic root of 20513958 is about 273.7472850589.

The spelling of 20513958 in words is "twenty million, five hundred thirteen thousand, nine hundred fifty-eight".