20290434 has 16 divisors (see below), whose sum is σ = 40641888. Its totient is φ = 6753312.

The previous prime is 20290427. The next prime is 20290441. The reversal of 20290434 is 43409202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20290427) and next prime (20290441).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2574 + ... + 6870.

It is an arithmetic number, because the mean of its divisors is an integer number (2540118).

Almost surely, 2^20290434 is an apocalyptic number.

20290434 is an abundant number, since it is smaller than the sum of its proper divisors (20351454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20290434 is a wasteful number, since it uses less digits than its factorization.

20290434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5089.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20290434 is about 4504.4904262303. The cubic root of 20290434 is about 272.7493842477.

Adding to 20290434 its reverse (43409202), we get a palindrome (63699636).

The spelling of 20290434 in words is "twenty million, two hundred ninety thousand, four hundred thirty-four".