20197766 has 4 divisors (see below), whose sum is σ = 30296652. Its totient is φ = 10098882.

The previous prime is 20197763. The next prime is 20197769. The reversal of 20197766 is 66779102.

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 (20197763) and next prime (20197769).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20197763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5049440 + ... + 5049443.

It is an arithmetic number, because the mean of its divisors is an integer number (7574163).

Almost surely, 2^20197766 is an apocalyptic number.

20197766 is a deficient number, since it is larger than the sum of its proper divisors (10098886).

20197766 is a wasteful number, since it uses less digits than its factorization.

20197766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10098885.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 20197766 is about 4494.1924747389. The cubic root of 20197766 is about 272.3335279265. Note that the first 3 decimals are identical.

The spelling of 20197766 in words is "twenty million, one hundred ninety-seven thousand, seven hundred sixty-six".