20694993 has 24 divisors (see below), whose sum is σ = 31000704. Its totient is φ = 12265440.

The previous prime is 20694983. The next prime is 20695021. The reversal of 20694993 is 39949602.

It is not a de Polignac number, because 20694993 - 2¹² = 20690897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20694943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16455 + ... + 17667.

It is an arithmetic number, because the mean of its divisors is an integer number (1291696).

Almost surely, 2^20694993 is an apocalyptic number.

It is an amenable number.

20694993 is a deficient number, since it is larger than the sum of its proper divisors (10305711).

20694993 is a wasteful number, since it uses less digits than its factorization.

20694993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285 (or 1274 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 20694993 is about 4549.1749801475. The cubic root of 20694993 is about 274.5501980187.

The spelling of 20694993 in words is "twenty million, six hundred ninety-four thousand, nine hundred ninety-three".