20720958 has 32 divisors (see below), whose sum is σ = 43241472. Its totient is φ = 6612000.

The previous prime is 20720951. The next prime is 20720971. The reversal of 20720958 is 85902702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720951) 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, 18235 + ... + 19337.

It is an arithmetic number, because the mean of its divisors is an integer number (1351296).

Almost surely, 2^20720958 is an apocalyptic number.

20720958 is an abundant number, since it is smaller than the sum of its proper divisors (22520514).

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

20720958 is a wasteful number, since it uses less digits than its factorization.

20720958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 20720958 is about 4552.0278997388. The cubic root of 20720958 is about 274.6649716200.

The spelling of 20720958 in words is "twenty million, seven hundred twenty thousand, nine hundred fifty-eight".