20396970 has 72 divisors (see below), whose sum is σ = 58322628. Its totient is φ = 4942080.

The previous prime is 20396963. The next prime is 20396983. The reversal of 20396970 is 7969302.

It can be written as a sum of positive squares in 2 ways, for example, as 17564481 + 2832489 = 4191^2 + 1683^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9954 + ... + 11826.

Almost surely, 2^20396970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20396970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29161314).

20396970 is an abundant number, since it is smaller than the sum of its proper divisors (37925658).

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

20396970 is a wasteful number, since it uses less digits than its factorization.

20396970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908 (or 1894 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 20396970 is about 4516.3004771605. The cubic root of 20396970 is about 273.2259129084.

It can be divided in two parts, 2039 and 6970, that added together give a palindrome (9009).

The spelling of 20396970 in words is "twenty million, three hundred ninety-six thousand, nine hundred seventy".