20252129 has 4 divisors (see below), whose sum is σ = 20291376. Its totient is φ = 20212884.

The previous prime is 20252107. The next prime is 20252131. The reversal of 20252129 is 92125202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20252129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20252149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18839 + ... + 19884.

It is an arithmetic number, because the mean of its divisors is an integer number (5072844).

Almost surely, 2^20252129 is an apocalyptic number.

It is an amenable number.

20252129 is a deficient number, since it is larger than the sum of its proper divisors (39247).

20252129 is an equidigital number, since it uses as much as digits as its factorization.

20252129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39246.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 20252129 is about 4500.2365493383. The cubic root of 20252129 is about 272.5776408117.

The spelling of 20252129 in words is "twenty million, two hundred fifty-two thousand, one hundred twenty-nine".