20051902 has 8 divisors (see below), whose sum is σ = 32391576. Its totient is φ = 9254712.

The previous prime is 20051893. The next prime is 20051921. The reversal of 20051902 is 20915002.

20051902 is nontrivially palindromic in base 7.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20051902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385588 + ... + 385639.

It is an arithmetic number, because the mean of its divisors is an integer number (4048947).

Almost surely, 2^20051902 is an apocalyptic number.

20051902 is a deficient number, since it is larger than the sum of its proper divisors (12339674).

20051902 is a wasteful number, since it uses less digits than its factorization.

20051902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771242.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 20051902 is about 4477.9350151604. The cubic root of 20051902 is about 271.6763650085.

Adding to 20051902 its reverse (20915002), we get a palindrome (40966904).

The spelling of 20051902 in words is "twenty million, fifty-one thousand, nine hundred two".