20674387 has 4 divisors (see below), whose sum is σ = 20923560. Its totient is φ = 20425216.

The previous prime is 20674369. The next prime is 20674393. The reversal of 20674387 is 78347602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20674387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20674307) 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, 124462 + ... + 124627.

It is an arithmetic number, because the mean of its divisors is an integer number (5230890).

Almost surely, 2^20674387 is an apocalyptic number.

20674387 is a deficient number, since it is larger than the sum of its proper divisors (249173).

20674387 is an equidigital number, since it uses as much as digits as its factorization.

20674387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249172.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 20674387 is about 4546.9096098339. The cubic root of 20674387 is about 274.4590445675.

The spelling of 20674387 in words is "twenty million, six hundred seventy-four thousand, three hundred eighty-seven".