20435425 has 12 divisors (see below), whose sum is σ = 25959276. Its totient is φ = 15948800.

The previous prime is 20435423. The next prime is 20435447. The reversal of 20435425 is 52453402.

It can be written as a sum of positive squares in 6 ways, for example, as 6507601 + 13927824 = 2551^2 + 3732^2 .

It is not a de Polignac number, because 20435425 - 2¹ = 20435423 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 20435425.

It is not an unprimeable number, because it can be changed into a prime (20435423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8944 + ... + 10993.

It is an arithmetic number, because the mean of its divisors is an integer number (2163273).

Almost surely, 2^20435425 is an apocalyptic number.

20435425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20435425 is a deficient number, since it is larger than the sum of its proper divisors (5523851).

20435425 is a wasteful number, since it uses less digits than its factorization.

20435425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19988 (or 19983 counting only the distinct ones).

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

The square root of 20435425 is about 4520.5558286565. Note that the first 3 decimals coincide. The cubic root of 20435425 is about 273.3975120299.

Adding to 20435425 its reverse (52453402), we get a palindrome (72888827).

The spelling of 20435425 in words is "twenty million, four hundred thirty-five thousand, four hundred twenty-five".