20256761 has 8 divisors (see below), whose sum is σ = 23949120. Its totient is φ = 16764048.

The previous prime is 20256751. The next prime is 20256763. The reversal of 20256761 is 16765202.

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

It is not a de Polignac number, because 20256761 - 2²² = 16062457 is a prime.

It is a super-2 number, since 2×20256761² = 820672732422242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20256763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49691 + ... + 50096.

It is an arithmetic number, because the mean of its divisors is an integer number (2993640).

Almost surely, 2^20256761 is an apocalyptic number.

It is an amenable number.

20256761 is a deficient number, since it is larger than the sum of its proper divisors (3692359).

20256761 is an equidigital number, since it uses as much as digits as its factorization.

20256761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99823.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20256761 is about 4500.7511595288. The cubic root of 20256761 is about 272.5984202465.

The spelling of 20256761 in words is "twenty million, two hundred fifty-six thousand, seven hundred sixty-one".