20438902 has 16 divisors (see below), whose sum is σ = 33530112. Its totient is φ = 9266920.

The previous prime is 20438863. The next prime is 20438909. The reversal of 20438902 is 20983402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20438909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10143 + ... + 11989.

It is an arithmetic number, because the mean of its divisors is an integer number (2095632).

Almost surely, 2^20438902 is an apocalyptic number.

20438902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20438902 is a deficient number, since it is larger than the sum of its proper divisors (13091210).

20438902 is a wasteful number, since it uses less digits than its factorization.

20438902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20438902 is about 4520.9403889014. The cubic root of 20438902 is about 273.4130169557.

The spelling of 20438902 in words is "twenty million, four hundred thirty-eight thousand, nine hundred two".