20534425 has 6 divisors (see below), whose sum is σ = 25462718. Its totient is φ = 16427520.

The previous prime is 20534413. The next prime is 20534429. The reversal of 20534425 is 52443502.

It can be written as a sum of positive squares in 3 ways, for example, as 499849 + 20034576 = 707^2 + 4476^2 .

It is not a de Polignac number, because 20534425 - 2¹⁷ = 20403353 is a prime.

It is a super-2 number, since 2×20534425² = 843325220161250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 821377 = 20534425 / (2 + 0 + 5 + 3 + 4 + 4 + 2 + 5).

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 20534425.

It is not an unprimeable number, because it can be changed into a prime (20534429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 410664 + ... + 410713.

Almost surely, 2^20534425 is an apocalyptic number.

20534425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20534425 is a deficient number, since it is larger than the sum of its proper divisors (4928293).

20534425 is an equidigital number, since it uses as much as digits as its factorization.

20534425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821387 (or 821382 counting only the distinct ones).

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

The square root of 20534425 is about 4531.4925797137. The cubic root of 20534425 is about 273.8382950173.

Adding to 20534425 its reverse (52443502), we get a palindrome (72977927).

The spelling of 20534425 in words is "twenty million, five hundred thirty-four thousand, four hundred twenty-five".