20251285 has 8 divisors (see below), whose sum is σ = 24343200. Its totient is φ = 16173264.

The previous prime is 20251249. The next prime is 20251303. The reversal of 20251285 is 58215202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20251285 - 2⁹ = 20250773 is a prime.

It is a super-2 number, since 2×20251285² = 820229088302450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66 + ... + 6364.

It is an arithmetic number, because the mean of its divisors is an integer number (3042900).

Almost surely, 2^20251285 is an apocalyptic number.

It is an amenable number.

20251285 is a deficient number, since it is larger than the sum of its proper divisors (4091915).

20251285 is an equidigital number, since it uses as much as digits as its factorization.

20251285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6947.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 20251285 is about 4500.1427755128. The cubic root of 20251285 is about 272.5738542349.

Adding to 20251285 its reverse (58215202), we get a palindrome (78466487).

The spelling of 20251285 in words is "twenty million, two hundred fifty-one thousand, two hundred eighty-five".