20720458 has 8 divisors (see below), whose sum is σ = 33906240. Its totient is φ = 9418380.

The previous prime is 20720449. The next prime is 20720459. The reversal of 20720458 is 85402702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20720459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470898 + ... + 470941.

It is an arithmetic number, because the mean of its divisors is an integer number (4238280).

Almost surely, 2^20720458 is an apocalyptic number.

20720458 is a deficient number, since it is larger than the sum of its proper divisors (13185782).

20720458 is a wasteful number, since it uses less digits than its factorization.

20720458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941852.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 20720458 is about 4551.9729788302. The cubic root of 20720458 is about 274.6627623658.

The spelling of 20720458 in words is "twenty million, seven hundred twenty thousand, four hundred fifty-eight".