20870458 has 16 divisors (see below), whose sum is σ = 37882944. Its totient is φ = 8418240.

The previous prime is 20870449. The next prime is 20870467. The reversal of 20870458 is 85407802.

It is an interprime number because it is at equal distance from previous prime (20870449) and next prime (20870467).

It is a Harshad number since it is a multiple of its sum of digits (34).

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, 43608 + ... + 44083.

It is an arithmetic number, because the mean of its divisors is an integer number (2367684).

Almost surely, 2^20870458 is an apocalyptic number.

20870458 is a deficient number, since it is larger than the sum of its proper divisors (17012486).

20870458 is a wasteful number, since it uses less digits than its factorization.

20870458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87717.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 20870458 is about 4568.4196392188. The cubic root of 20870458 is about 275.3239510170.

The spelling of 20870458 in words is "twenty million, eight hundred seventy thousand, four hundred fifty-eight".