20996765 has 8 divisors (see below), whose sum is σ = 26009088. Its totient is φ = 16255440.

The previous prime is 20996753. The next prime is 20996777. The reversal of 20996765 is 56769902.

It is an interprime number because it is at equal distance from previous prime (20996753) and next prime (20996777).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20996765 - 2¹² = 20992669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67577 + ... + 67886.

It is an arithmetic number, because the mean of its divisors is an integer number (3251136).

Almost surely, 2^20996765 is an apocalyptic number.

It is an amenable number.

20996765 is a deficient number, since it is larger than the sum of its proper divisors (5012323).

20996765 is a wasteful number, since it uses less digits than its factorization.

20996765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135499.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 20996765 is about 4582.2227139239. Note that the first 3 decimals coincide. The cubic root of 20996765 is about 275.8782500539.

The spelling of 20996765 in words is "twenty million, nine hundred ninety-six thousand, seven hundred sixty-five".