20763865 has 16 divisors (see below), whose sum is σ = 26449920. Its totient is φ = 15603840.

The previous prime is 20763839. The next prime is 20763881. The reversal of 20763865 is 56836702.

It is not a de Polignac number, because 20763865 - 2¹⁵ = 20731097 is a prime.

It is a super-2 number, since 2×20763865² = 862276179476450, which contains 22 as substring.

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, 11205 + ... + 12925.

It is an arithmetic number, because the mean of its divisors is an integer number (1653120).

Almost surely, 2^20763865 is an apocalyptic number.

It is an amenable number.

20763865 is a deficient number, since it is larger than the sum of its proper divisors (5686055).

20763865 is a wasteful number, since it uses less digits than its factorization.

20763865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 20763865 is about 4556.7384168943. The cubic root of 20763865 is about 274.8544243282.

The spelling of 20763865 in words is "twenty million, seven hundred sixty-three thousand, eight hundred sixty-five".