20508770 has 8 divisors (see below), whose sum is σ = 36915804. Its totient is φ = 8203504.

The previous prime is 20508731. The next prime is 20508781. The reversal of 20508770 is 7780502.

It can be written as a sum of positive squares in 2 ways, for example, as 19193161 + 1315609 = 4381^2 + 1147^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1025429 + ... + 1025448.

Almost surely, 2^20508770 is an apocalyptic number.

20508770 is a deficient number, since it is larger than the sum of its proper divisors (16407034).

20508770 is a wasteful number, since it uses less digits than its factorization.

20508770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050884.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 20508770 is about 4528.6609499939. The cubic root of 20508770 is about 273.7242061280.

The spelling of 20508770 in words is "twenty million, five hundred eight thousand, seven hundred seventy".