20626129 has 4 divisors (see below), whose sum is σ = 21291520. Its totient is φ = 19960740.

The previous prime is 20626127. The next prime is 20626171. The reversal of 20626129 is 92162602.

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 not a de Polignac number, because 20626129 - 2¹ = 20626127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20626097 and 20626106.

It is not an unprimeable number, because it can be changed into a prime (20626121) 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, 332649 + ... + 332710.

It is an arithmetic number, because the mean of its divisors is an integer number (5322880).

Almost surely, 2^20626129 is an apocalyptic number.

It is an amenable number.

20626129 is a deficient number, since it is larger than the sum of its proper divisors (665391).

20626129 is an equidigital number, since it uses as much as digits as its factorization.

20626129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665390.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 20626129 is about 4541.5998282544. The cubic root of 20626129 is about 274.2453314468.

It can be divided in two parts, 206 and 26129, that added together give a triangular number (26335 = T₂₂₉).

The spelling of 20626129 in words is "twenty million, six hundred twenty-six thousand, one hundred twenty-nine".