20823902 has 16 divisors (see below), whose sum is σ = 34290432. Its totient is φ = 9405720.

The previous prime is 20823899. The next prime is 20823919. The reversal of 20823902 is 20932802.

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, 683 + ... + 6489.

It is an arithmetic number, because the mean of its divisors is an integer number (2143152).

Almost surely, 2^20823902 is an apocalyptic number.

20823902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20823902 is a deficient number, since it is larger than the sum of its proper divisors (13466530).

20823902 is a wasteful number, since it uses less digits than its factorization.

20823902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5983.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20823902 is about 4563.3213781192. The cubic root of 20823902 is about 275.1190757052.

Subtracting 20823902 from its reverse (20932802), we obtain a square (108900 = 330²).

The spelling of 20823902 in words is "twenty million, eight hundred twenty-three thousand, nine hundred two".