20434520 has 32 divisors (see below), whose sum is σ = 46116000. Its totient is φ = 8149248.

The previous prime is 20434507. The next prime is 20434537. The reversal of 20434520 is 2543402.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20434492 and 20434501.

It is a congruent number.

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, 18956 + ... + 20004.

It is an arithmetic number, because the mean of its divisors is an integer number (1441125).

Almost surely, 2^20434520 is an apocalyptic number.

20434520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20434520 is an abundant number, since it is smaller than the sum of its proper divisors (25681480).

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

20434520 is a wasteful number, since it uses less digits than its factorization.

20434520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547 (or 1543 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20434520 is about 4520.4557292379. The cubic root of 20434520 is about 273.3934760907.

Adding to 20434520 its reverse (2543402), we get a palindrome (22977922).

The spelling of 20434520 in words is "twenty million, four hundred thirty-four thousand, five hundred twenty".