20361765 has 16 divisors (see below), whose sum is σ = 32635008. Its totient is φ = 10840896.

The previous prime is 20361751. The next prime is 20361791. The reversal of 20361765 is 56716302.

It is not a de Polignac number, because 20361765 - 2¹⁶ = 20296229 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15307 + ... + 16583.

It is an arithmetic number, because the mean of its divisors is an integer number (2039688).

Almost surely, 2^20361765 is an apocalyptic number.

It is an amenable number.

20361765 is a deficient number, since it is larger than the sum of its proper divisors (12273243).

20361765 is a wasteful number, since it uses less digits than its factorization.

20361765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2348.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20361765 is about 4512.4012454568. The cubic root of 20361765 is about 273.0686271672.

The spelling of 20361765 in words is "twenty million, three hundred sixty-one thousand, seven hundred sixty-five".