20456261 has 8 divisors (see below), whose sum is σ = 23922624. Its totient is φ = 17125920.

The previous prime is 20456257. The next prime is 20456309. The reversal of 20456261 is 16265402.

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

It is not a de Polignac number, because 20456261 - 2² = 20456257 is a prime.

It is a super-2 number, since 2×20456261² = 836917228200242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20456261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20456221) 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, 33680 + ... + 34281.

It is an arithmetic number, because the mean of its divisors is an integer number (2990328).

Almost surely, 2^20456261 is an apocalyptic number.

It is an amenable number.

20456261 is a deficient number, since it is larger than the sum of its proper divisors (3466363).

20456261 is an equidigital number, since it uses as much as digits as its factorization.

20456261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68011.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20456261 is about 4522.8598253760. The cubic root of 20456261 is about 273.4903993502.

It can be divided in two parts, 204 and 56261, that added together give a palindrome (56465).

The spelling of 20456261 in words is "twenty million, four hundred fifty-six thousand, two hundred sixty-one".