20660370 has 16 divisors (see below), whose sum is σ = 49584960. Its totient is φ = 5509424.

The previous prime is 20660347. The next prime is 20660377. The reversal of 20660370 is 7306602.

It is a super-3 number, since 3×20660370³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20660370.

It is not an unprimeable number, because it can be changed into a prime (20660377) 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, 344310 + ... + 344369.

It is an arithmetic number, because the mean of its divisors is an integer number (3099060).

Almost surely, 2^20660370 is an apocalyptic number.

20660370 is an abundant number, since it is smaller than the sum of its proper divisors (28924590).

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

20660370 is a wasteful number, since it uses less digits than its factorization.

20660370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688689.

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 20660370 is about 4545.3679719028. The cubic root of 20660370 is about 274.3970038376.

Adding to 20660370 its reverse (7306602), we get a palindrome (27966972).

The spelling of 20660370 in words is "twenty million, six hundred sixty thousand, three hundred seventy".