18820967 has 4 divisors (see below), whose sum is σ = 20531976. Its totient is φ = 17109960.

The previous prime is 18820961. The next prime is 18820973. The reversal of 18820967 is 76902881.

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

It is an interprime number because it is at equal distance from previous prime (18820961) and next prime (18820973).

It is a cyclic number.

It is not a de Polignac number, because 18820967 - 2²² = 14626663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18820961) 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, 855488 + ... + 855509.

It is an arithmetic number, because the mean of its divisors is an integer number (5132994).

Almost surely, 2^18820967 is an apocalyptic number.

18820967 is a deficient number, since it is larger than the sum of its proper divisors (1711009).

18820967 is a wasteful number, since it uses less digits than its factorization.

18820967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711008.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 18820967 is about 4338.3138429579. The cubic root of 18820967 is about 265.9993922763. Note that the first 3 decimals are identical.

The spelling of 18820967 in words is "eighteen million, eight hundred twenty thousand, nine hundred sixty-seven".