20398697 has 8 divisors (see below), whose sum is σ = 22291200. Its totient is φ = 18512560.

The previous prime is 20398663. The next prime is 20398699. The reversal of 20398697 is 79689302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20398697 - 2¹⁰ = 20397673 is a prime.

It is a super-2 number, since 2×20398697² = 832213678595618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20398699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7304 + ... + 9702.

It is an arithmetic number, because the mean of its divisors is an integer number (2786400).

Almost surely, 2^20398697 is an apocalyptic number.

It is an amenable number.

20398697 is a deficient number, since it is larger than the sum of its proper divisors (1892503).

20398697 is a wasteful number, since it uses less digits than its factorization.

20398697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3183.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 20398697 is about 4516.4916694266. The cubic root of 20398697 is about 273.2336239857.

Subtracting 20398697 from its reverse (79689302), we obtain a triangular number (59290605 = T₁₀₈₈₉).

The spelling of 20398697 in words is "twenty million, three hundred ninety-eight thousand, six hundred ninety-seven".