20389902 has 32 divisors (see below), whose sum is σ = 46503072. Its totient is φ = 5904384.

The previous prime is 20389883. The next prime is 20389903. The reversal of 20389902 is 20998302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20389903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6363 + ... + 9014.

It is an arithmetic number, because the mean of its divisors is an integer number (1453221).

Almost surely, 2^20389902 is an apocalyptic number.

20389902 is an abundant number, since it is smaller than the sum of its proper divisors (26113170).

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

20389902 is a wasteful number, since it uses less digits than its factorization.

20389902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15412.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 20389902 is about 4515.5179104949. The cubic root of 20389902 is about 273.1943496606.

Subtracting 20389902 from its reverse (20998302), we obtain a square (608400 = 780²).

The spelling of 20389902 in words is "twenty million, three hundred eighty-nine thousand, nine hundred two".