20745425 has 24 divisors (see below), whose sum is σ = 27170880. Its totient is φ = 15681600.

The previous prime is 20745421. The next prime is 20745427. The reversal of 20745425 is 52454702.

It is a happy number.

It is not a de Polignac number, because 20745425 - 2² = 20745421 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20745421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62510 + ... + 62840.

It is an arithmetic number, because the mean of its divisors is an integer number (1132120).

Almost surely, 2^20745425 is an apocalyptic number.

20745425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20745425 is a deficient number, since it is larger than the sum of its proper divisors (6425455).

20745425 is a wasteful number, since it uses less digits than its factorization.

20745425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473 (or 468 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 20745425 is about 4554.7145903997. The cubic root of 20745425 is about 274.7730358731.

The spelling of 20745425 in words is "twenty million, seven hundred forty-five thousand, four hundred twenty-five".