20406059 has 4 divisors (see below), whose sum is σ = 20491680. Its totient is φ = 20320440.

The previous prime is 20406017. The next prime is 20406107. The reversal of 20406059 is 95060402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95060402 = 2 ⋅47530201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20406059 is a prime.

It is a super-2 number, since 2×20406059² = 832814487822962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20406259) 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, 42452 + ... + 42929.

It is an arithmetic number, because the mean of its divisors is an integer number (5122920).

Almost surely, 2^20406059 is an apocalyptic number.

20406059 is a deficient number, since it is larger than the sum of its proper divisors (85621).

20406059 is an equidigital number, since it uses as much as digits as its factorization.

20406059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85620.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20406059 is about 4517.3066090315. The cubic root of 20406059 is about 273.2664905294.

The spelling of 20406059 in words is "twenty million, four hundred six thousand, fifty-nine".