20663955 has 24 divisors (see below), whose sum is σ = 38573808. Its totient is φ = 10172736.

The previous prime is 20663927. The next prime is 20663969. The reversal of 20663955 is 55936602.

It is not a de Polignac number, because 20663955 - 2¹⁰ = 20662931 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17077 + ... + 18246.

It is an arithmetic number, because the mean of its divisors is an integer number (1607242).

Almost surely, 2^20663955 is an apocalyptic number.

20663955 is a deficient number, since it is larger than the sum of its proper divisors (17909853).

20663955 is a wasteful number, since it uses less digits than its factorization.

20663955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35347 (or 35344 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 20663955 is about 4545.7623123080. The cubic root of 20663955 is about 274.4128740981.

The spelling of 20663955 in words is "twenty million, six hundred sixty-three thousand, nine hundred fifty-five".