20434512 has 80 divisors (see below), whose sum is σ = 61380992. Its totient is φ = 5736960.

The previous prime is 20434507. The next prime is 20434537. The reversal of 20434512 is 21543402.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19998 + ... + 20994.

Almost surely, 2^20434512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20434512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30690496).

20434512 is an abundant number, since it is smaller than the sum of its proper divisors (40946480).

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

20434512 is a wasteful number, since it uses less digits than its factorization.

20434512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076 (or 1070 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20434512 is about 4520.4548443713. The cubic root of 20434512 is about 273.3934404133.

Adding to 20434512 its reverse (21543402), we get a palindrome (41977914).

It can be divided in two parts, 2043 and 4512, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 20434512 in words is "twenty million, four hundred thirty-four thousand, five hundred twelve".