20290129 has 4 divisors (see below), whose sum is σ = 21483684. Its totient is φ = 19096576.

The previous prime is 20290099. The next prime is 20290133. The reversal of 20290129 is 92109202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5452225 + 14837904 = 2335^2 + 3852^2 .

It is not a de Polignac number, because 20290129 - 2⁷ = 20290001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20290139) 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, 596752 + ... + 596785.

It is an arithmetic number, because the mean of its divisors is an integer number (5370921).

Almost surely, 2^20290129 is an apocalyptic number.

It is an amenable number.

20290129 is a deficient number, since it is larger than the sum of its proper divisors (1193555).

20290129 is a wasteful number, since it uses less digits than its factorization.

20290129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193554.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 20290129 is about 4504.4565709972. The cubic root of 20290129 is about 272.7480176106.

The spelling of 20290129 in words is "twenty million, two hundred ninety thousand, one hundred twenty-nine".