20746388 has 12 divisors (see below), whose sum is σ = 39099060. Its totient is φ = 9575232.

The previous prime is 20746387. The next prime is 20746393. The reversal of 20746388 is 88364702.

It can be written as a sum of positive squares in 2 ways, for example, as 7409284 + 13337104 = 2722^2 + 3652^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20746387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199433 + ... + 199536.

It is an arithmetic number, because the mean of its divisors is an integer number (3258255).

Almost surely, 2^20746388 is an apocalyptic number.

It is an amenable number.

20746388 is a deficient number, since it is larger than the sum of its proper divisors (18352672).

20746388 is a wasteful number, since it uses less digits than its factorization.

20746388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398986 (or 398984 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 20746388 is about 4554.8203038100. The cubic root of 20746388 is about 274.7772874505. Note that the first 3 decimals are identical.

The spelling of 20746388 in words is "twenty million, seven hundred forty-six thousand, three hundred eighty-eight".