20203902 has 24 divisors (see below), whose sum is σ = 44394480. Its totient is φ = 6639360.

The previous prime is 20203891. The next prime is 20203903. The reversal of 20203902 is 20930202.

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 (20203903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6627 + ... + 9182.

It is an arithmetic number, because the mean of its divisors is an integer number (1849770).

Almost surely, 2^20203902 is an apocalyptic number.

20203902 is an abundant number, since it is smaller than the sum of its proper divisors (24190578).

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

20203902 is a wasteful number, since it uses less digits than its factorization.

20203902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15888 (or 15885 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20203902 is about 4494.8750816903. The cubic root of 20203902 is about 272.3611030774.

The spelling of 20203902 in words is "twenty million, two hundred three thousand, nine hundred two".