20387425 has 12 divisors (see below), whose sum is σ = 25819776. Its totient is φ = 15962000.

The previous prime is 20387401. The next prime is 20387431. The reversal of 20387425 is 52478302.

It is not a de Polignac number, because 20387425 - 2²¹ = 18290273 is a prime.

It is a Duffinian 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, 7501 + ... + 9850.

It is an arithmetic number, because the mean of its divisors is an integer number (2151648).

Almost surely, 2^20387425 is an apocalyptic number.

20387425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20387425 is a deficient number, since it is larger than the sum of its proper divisors (5432351).

20387425 is a wasteful number, since it uses less digits than its factorization.

20387425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17408 (or 17403 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 20387425 is about 4515.2436257637. The cubic root of 20387425 is about 273.1832865077.

The spelling of 20387425 in words is "twenty million, three hundred eighty-seven thousand, four hundred twenty-five".