20699425 has 12 divisors (see below), whose sum is σ = 26784000. Its totient is φ = 15839120.

The previous prime is 20699423. The next prime is 20699431. The reversal of 20699425 is 52499602.

It is not a de Polignac number, because 20699425 - 2¹ = 20699423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20699423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17425 + ... + 18574.

It is an arithmetic number, because the mean of its divisors is an integer number (2232000).

Almost surely, 2^20699425 is an apocalyptic number.

20699425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20699425 is a deficient number, since it is larger than the sum of its proper divisors (6084575).

20699425 is a wasteful number, since it uses less digits than its factorization.

20699425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36032 (or 36027 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 20699425 is about 4549.6620753634. The cubic root of 20699425 is about 274.5697956677.

The spelling of 20699425 in words is "twenty million, six hundred ninety-nine thousand, four hundred twenty-five".