20553970 has 8 divisors (see below), whose sum is σ = 36997164. Its totient is φ = 8221584.

The previous prime is 20553947. The next prime is 20553979. The reversal of 20553970 is 7935502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19210689 + 1343281 = 4383^2 + 1159^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20553979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1027689 + ... + 1027708.

Almost surely, 2^20553970 is an apocalyptic number.

20553970 is a deficient number, since it is larger than the sum of its proper divisors (16443194).

20553970 is a wasteful number, since it uses less digits than its factorization.

20553970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2055404.

The product of its (nonzero) digits is 9450, while the sum is 31.

The square root of 20553970 is about 4533.6486409955. The cubic root of 20553970 is about 273.9251487159.

The spelling of 20553970 in words is "twenty million, five hundred fifty-three thousand, nine hundred seventy".