20970870 has 32 divisors (see below), whose sum is σ = 52980480. Its totient is φ = 5297760.

The previous prime is 20970869. The next prime is 20970893. The reversal of 20970870 is 7807902.

It is a super-3 number, since 3×20970870³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17826 + ... + 18965.

It is an arithmetic number, because the mean of its divisors is an integer number (1655640).

Almost surely, 2^20970870 is an apocalyptic number.

20970870 is an abundant number, since it is smaller than the sum of its proper divisors (32009610).

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

20970870 is a wasteful number, since it uses less digits than its factorization.

20970870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36820.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 20970870 is about 4579.3962484153. The cubic root of 20970870 is about 275.7647912091.

The spelling of 20970870 in words is "twenty million, nine hundred seventy thousand, eight hundred seventy".