20693401 has 3 divisors (see below), whose sum is σ = 20697951. Its totient is φ = 20688852.

The previous prime is 20693389. The next prime is 20693423. The reversal of 20693401 is 10439602.

The square root of 20693401 is 4549.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10439602 = 2 ⋅5219801.

It can be written as a sum of positive squares in only one way, i.e., 15217801 + 5475600 = 3901^2 + 2340^2 .

It is not a de Polignac number, because 20693401 - 2⁷ = 20693273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20699401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2275 + ... + 6823.

It is an arithmetic number, because the mean of its divisors is an integer number (6899317).

Almost surely, 2^20693401 is an apocalyptic number.

20693401 is the 4549-th square number.

20693401 is the 2275-th centered octagonal number.

It is an amenable number.

20693401 is a deficient number, since it is larger than the sum of its proper divisors (4550).

20693401 is an frugal number, since it uses more digits than its factorization.

20693401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9098 (or 4549 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The cubic root of 20693401 is about 274.5431577470.

Multiplying 20693401 by its sum of digits (25), we get a square (517335025 = 22745²).

Multiplying 20693401 by its product of nonzero digits (1296), we get a square (26818647696 = 163764²).

The spelling of 20693401 in words is "twenty million, six hundred ninety-three thousand, four hundred one".