20693402 has 8 divisors (see below), whose sum is σ = 31151412. Its totient is φ = 10309600.

The previous prime is 20693389. The next prime is 20693423. The reversal of 20693402 is 20439602.

It is a Cunningham number, because it is equal to 4549²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 20693401 + 1 = 4549^2 + 1^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 17849 + ... + 18972.

Almost surely, 2^20693402 is an apocalyptic number.

20693402 is a deficient number, since it is larger than the sum of its proper divisors (10458010).

20693402 is a wasteful number, since it uses less digits than its factorization.

20693402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37104.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20693402 is about 4549.0001099143. Note that the first 3 decimals coincide. The cubic root of 20693402 is about 274.5431621694.

The spelling of 20693402 in words is "twenty million, six hundred ninety-three thousand, four hundred two".