20285739 has 6 divisors (see below), whose sum is σ = 29301636. Its totient is φ = 13523820.

The previous prime is 20285737. The next prime is 20285753. The reversal of 20285739 is 93758202.

It is a happy number.

It is not a de Polignac number, because 20285739 - 2¹ = 20285737 is a prime.

It is a super-2 number, since 2×20285739² = 823022413552242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20285737) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1126977 + ... + 1126994.

It is an arithmetic number, because the mean of its divisors is an integer number (4883606).

Almost surely, 2^20285739 is an apocalyptic number.

20285739 is a deficient number, since it is larger than the sum of its proper divisors (9015897).

20285739 is a wasteful number, since it uses less digits than its factorization.

20285739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2253977 (or 2253974 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 20285739 is about 4503.9692494510. The cubic root of 20285739 is about 272.7283454806.

The spelling of 20285739 in words is "twenty million, two hundred eighty-five thousand, seven hundred thirty-nine".