20457387 has 16 divisors (see below), whose sum is σ = 30806560. Its totient is φ = 13413600.

The previous prime is 20457377. The next prime is 20457391. The reversal of 20457387 is 78375402.

20457387 is a `hidden beast` number, since 2 + 0 + 4 + 573 + 87 = 666.

It is not a de Polignac number, because 20457387 - 2⁶ = 20457323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20457317) 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 15 ways as a sum of consecutive naturals, for example, 4564 + ... + 7857.

It is an arithmetic number, because the mean of its divisors is an integer number (1925410).

Almost surely, 2^20457387 is an apocalyptic number.

20457387 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20457387 is a deficient number, since it is larger than the sum of its proper divisors (10349173).

20457387 is a wasteful number, since it uses less digits than its factorization.

20457387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12491 (or 12485 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 20457387 is about 4522.9843024269. The cubic root of 20457387 is about 273.4954172848.

The spelling of 20457387 in words is "twenty million, four hundred fifty-seven thousand, three hundred eighty-seven".