20390902 has 16 divisors (see below), whose sum is σ = 35616672. Its totient is φ = 8573760.

The previous prime is 20390893. The next prime is 20390911. The reversal of 20390902 is 20909302.

It is an interprime number because it is at equal distance from previous prime (20390893) and next prime (20390911).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12999 + ... + 14482.

It is an arithmetic number, because the mean of its divisors is an integer number (2226042).

Almost surely, 2^20390902 is an apocalyptic number.

20390902 is a deficient number, since it is larger than the sum of its proper divisors (15225770).

20390902 is a wasteful number, since it uses less digits than its factorization.

20390902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27543.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 20390902 is about 4515.6286384068. The cubic root of 20390902 is about 273.1988157583.

Subtracting 20390902 from its reverse (20909302), we obtain a square (518400 = 720²).

The spelling of 20390902 in words is "twenty million, three hundred ninety thousand, nine hundred two".