20793409 has 16 divisors (see below), whose sum is σ = 25909632. Its totient is φ = 16247808.

The previous prime is 20793407. The next prime is 20793419. The reversal of 20793409 is 90439702.

It is a cyclic number.

It is not a de Polignac number, because 20793409 - 2¹ = 20793407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20793407) 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, 6177 + ... + 8929.

It is an arithmetic number, because the mean of its divisors is an integer number (1619352).

Almost surely, 2^20793409 is an apocalyptic number.

It is an amenable number.

20793409 is a deficient number, since it is larger than the sum of its proper divisors (5116223).

20793409 is a wasteful number, since it uses less digits than its factorization.

20793409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2856.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20793409 is about 4559.9790569695. The cubic root of 20793409 is about 274.9847220162.

The spelling of 20793409 in words is "twenty million, seven hundred ninety-three thousand, four hundred nine".