20434525 has 12 divisors (see below), whose sum is σ = 25688212. Its totient is φ = 16122240.

The previous prime is 20434507. The next prime is 20434537. The reversal of 20434525 is 52543402.

It can be written as a sum of positive squares in 6 ways, for example, as 1258884 + 19175641 = 1122^2 + 4379^2 .

It is not a de Polignac number, because 20434525 - 2¹⁹ = 19910237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20434525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3774 + ... + 7423.

Almost surely, 2^20434525 is an apocalyptic number.

20434525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20434525 is a deficient number, since it is larger than the sum of its proper divisors (5253687).

20434525 is a wasteful number, since it uses less digits than its factorization.

20434525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11280 (or 11275 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 20434525 is about 4520.4562822795. The cubic root of 20434525 is about 273.3934983890.

Adding to 20434525 its reverse (52543402), we get a palindrome (72977927).

The spelling of 20434525 in words is "twenty million, four hundred thirty-four thousand, five hundred twenty-five".