20285951 has 12 divisors (see below), whose sum is σ = 23837400. Its totient is φ = 17211600.

The previous prime is 20285933. The next prime is 20285963. The reversal of 20285951 is 15958202.

It is a de Polignac number, because none of the positive numbers 2^k-20285951 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20285921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2900 + ... + 6998.

It is an arithmetic number, because the mean of its divisors is an integer number (1986450).

Almost surely, 2^20285951 is an apocalyptic number.

20285951 is a deficient number, since it is larger than the sum of its proper divisors (3551449).

20285951 is a wasteful number, since it uses less digits than its factorization.

20285951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4214 (or 4207 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 20285951 is about 4503.9927841860. The cubic root of 20285951 is about 272.7292955439.

The spelling of 20285951 in words is "twenty million, two hundred eighty-five thousand, nine hundred fifty-one".