20607993 has 16 divisors (see below), whose sum is σ = 34892160. Its totient is φ = 11775888.

The previous prime is 20607991. The next prime is 20608031. The reversal of 20607993 is 39970602.

It is not a de Polignac number, because 20607993 - 2¹ = 20607991 is a prime.

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 a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20607991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54330 + ... + 54707.

It is an arithmetic number, because the mean of its divisors is an integer number (2180760).

Almost surely, 2^20607993 is an apocalyptic number.

It is an amenable number.

20607993 is a deficient number, since it is larger than the sum of its proper divisors (14284167).

20607993 is a wasteful number, since it uses less digits than its factorization.

20607993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109053 (or 109047 counting only the distinct ones).

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

The square root of 20607993 is about 4539.6027359230. The cubic root of 20607993 is about 274.1649290311.

The spelling of 20607993 in words is "twenty million, six hundred seven thousand, nine hundred ninety-three".