20126669 has 4 divisors (see below), whose sum is σ = 20554944. Its totient is φ = 19698396.

The previous prime is 20126663. The next prime is 20126671. The reversal of 20126669 is 96662102.

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 20126669 - 2⁸ = 20126413 is a prime.

It is a super-2 number, since 2×20126669² = 810165610071122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20126663) 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, 214067 + ... + 214160.

It is an arithmetic number, because the mean of its divisors is an integer number (5138736).

Almost surely, 2^20126669 is an apocalyptic number.

It is an amenable number.

20126669 is a deficient number, since it is larger than the sum of its proper divisors (428275).

20126669 is an equidigital number, since it uses as much as digits as its factorization.

20126669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428274.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20126669 is about 4486.2756268424. The cubic root of 20126669 is about 272.0136103700.

The spelling of 20126669 in words is "twenty million, one hundred twenty-six thousand, six hundred sixty-nine".