20459011 has 4 divisors (see below), whose sum is σ = 20469024. Its totient is φ = 20449000.

The previous prime is 20458981. The next prime is 20459027. The reversal of 20459011 is 11095402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 11095402 = 2 ⋅5547701.

It is a 3-Lehmer number, since φ(20459011) divides (20459011-1)³.

It is a cyclic number.

It is not a de Polignac number, because 20459011 - 2⁷ = 20458883 is a prime.

It is a super-2 number, since 2×20459011² = 837142262196242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20459071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 715 + ... + 6436.

It is an arithmetic number, because the mean of its divisors is an integer number (5117256).

Almost surely, 2^20459011 is an apocalyptic number.

20459011 is the 2861-st heptagonal number.

20459011 is a deficient number, since it is larger than the sum of its proper divisors (10013).

20459011 is an equidigital number, since it uses as much as digits as its factorization.

20459011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10012.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 20459011 is about 4523.1638263499. The cubic root of 20459011 is about 273.5026541948.

The spelling of 20459011 in words is "twenty million, four hundred fifty-nine thousand, eleven".