20898693 has 6 divisors (see below), whose sum is σ = 30187014. Its totient is φ = 13932456.

The previous prime is 20898677. The next prime is 20898737. The reversal of 20898693 is 39689802.

It can be written as a sum of positive squares in only one way, i.e., 20223009 + 675684 = 4497^2 + 822^2 .

It is not a de Polignac number, because 20898693 - 2⁴ = 20898677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20898193) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1161030 + ... + 1161047.

It is an arithmetic number, because the mean of its divisors is an integer number (5031169).

Almost surely, 2^20898693 is an apocalyptic number.

It is an amenable number.

20898693 is a deficient number, since it is larger than the sum of its proper divisors (9288321).

20898693 is a wasteful number, since it uses less digits than its factorization.

20898693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322083 (or 2322080 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 20898693 is about 4571.5088318847. The cubic root of 20898693 is about 275.4480541673.

The spelling of 20898693 in words is "twenty million, eight hundred ninety-eight thousand, six hundred ninety-three".