20434087 has 4 divisors (see below), whose sum is σ = 20714080. Its totient is φ = 20154096.

The previous prime is 20434081. The next prime is 20434093. The reversal of 20434087 is 78043402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78043402 = 2 ⋅39021701.

It is an interprime number because it is at equal distance from previous prime (20434081) and next prime (20434093).

It is a cyclic number.

It is not a de Polignac number, because 20434087 - 2³ = 20434079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434081) 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, 139887 + ... + 140032.

It is an arithmetic number, because the mean of its divisors is an integer number (5178520).

Almost surely, 2^20434087 is an apocalyptic number.

20434087 is a deficient number, since it is larger than the sum of its proper divisors (279993).

20434087 is an equidigital number, since it uses as much as digits as its factorization.

20434087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279992.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 20434087 is about 4520.4078355830. The cubic root of 20434087 is about 273.3915450411.

Adding to 20434087 its reverse (78043402), we get a palindrome (98477489).

It can be divided in two parts, 2043 and 4087, that multiplied together give a triangular number (8349741 = T₄₀₈₆).

The spelling of 20434087 in words is "twenty million, four hundred thirty-four thousand, eighty-seven".