20939470 has 16 divisors (see below), whose sum is σ = 38310048. Its totient is φ = 8238240.

The previous prime is 20939459. The next prime is 20939473. The reversal of 20939470 is 7493902.

It is a super-2 number, since 2×20939470² = 876922807761800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20939473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16554 + ... + 17773.

It is an arithmetic number, because the mean of its divisors is an integer number (2394378).

Almost surely, 2^20939470 is an apocalyptic number.

20939470 is a deficient number, since it is larger than the sum of its proper divisors (17370578).

20939470 is a wasteful number, since it uses less digits than its factorization.

20939470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34395.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20939470 is about 4575.9665645632. The cubic root of 20939470 is about 275.6270868633.

The spelling of 20939470 in words is "twenty million, nine hundred thirty-nine thousand, four hundred seventy".