20906870 has 16 divisors (see below), whose sum is σ = 38087280. Its totient is φ = 8261664.

The previous prime is 20906863. The next prime is 20906903. The reversal of 20906870 is 7860902.

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, 11765 + ... + 13424.

It is an arithmetic number, because the mean of its divisors is an integer number (2380455).

Almost surely, 2^20906870 is an apocalyptic number.

20906870 is a deficient number, since it is larger than the sum of its proper divisors (17180410).

20906870 is a wasteful number, since it uses less digits than its factorization.

20906870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25279.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 20906870 is about 4572.4030880927. The cubic root of 20906870 is about 275.4839741974.

The spelling of 20906870 in words is "twenty million, nine hundred six thousand, eight hundred seventy".