20005902 has 24 divisors (see below), whose sum is σ = 49538736. Its totient is φ = 5715936.

The previous prime is 20005891. The next prime is 20005903. The reversal of 20005902 is 20950002.

It is a super-2 number, since 2×20005902² = 800472229667208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005903) 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, 79263 + ... + 79514.

It is an arithmetic number, because the mean of its divisors is an integer number (2064114).

Almost surely, 2^20005902 is an apocalyptic number.

20005902 is an abundant number, since it is smaller than the sum of its proper divisors (29532834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20005902 is a wasteful number, since it uses less digits than its factorization.

20005902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158792 (or 158789 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 20005902 is about 4472.7957699855. The cubic root of 20005902 is about 271.4684598547.

Adding to 20005902 its reverse (20950002), we get a palindrome (40955904).

The spelling of 20005902 in words is "twenty million, five thousand, nine hundred two".