20748767 has 4 divisors (see below), whose sum is σ = 22344840. Its totient is φ = 19152696.

The previous prime is 20748757. The next prime is 20748769. The reversal of 20748767 is 76784702.

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

It is a cyclic number.

It is not a de Polignac number, because 20748767 - 2⁴ = 20748751 is a prime.

It is a super-2 number, since 2×20748767² = 861022664040578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20748769) 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, 798017 + ... + 798042.

It is an arithmetic number, because the mean of its divisors is an integer number (5586210).

Almost surely, 2^20748767 is an apocalyptic number.

20748767 is a deficient number, since it is larger than the sum of its proper divisors (1596073).

20748767 is a wasteful number, since it uses less digits than its factorization.

20748767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596072.

The product of its (nonzero) digits is 131712, while the sum is 41.

The square root of 20748767 is about 4555.0814482290. The cubic root of 20748767 is about 274.7877900045.

The spelling of 20748767 in words is "twenty million, seven hundred forty-eight thousand, seven hundred sixty-seven".