20897793 has 12 divisors (see below), whose sum is σ = 34498048. Its totient is φ = 11941560.

The previous prime is 20897761. The next prime is 20897801. The reversal of 20897793 is 39779802.

It is not a de Polignac number, because 20897793 - 2⁵ = 20897761 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20897753) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 165793 + ... + 165918.

It is a Proth number, since it is equal to 2551 ⋅ 2¹³ + 1 and 2551 < 2¹³.

Almost surely, 2^20897793 is an apocalyptic number.

It is an amenable number.

20897793 is a deficient number, since it is larger than the sum of its proper divisors (13600255).

20897793 is a wasteful number, since it uses less digits than its factorization.

20897793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331724 (or 331721 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 20897793 is about 4571.4103950532. The cubic root of 20897793 is about 275.4441000635. Note that the first 3 decimals are identical.

The spelling of 20897793 in words is "twenty million, eight hundred ninety-seven thousand, seven hundred ninety-three".