20111902 has 4 divisors (see below), whose sum is σ = 30167856. Its totient is φ = 10055950.

The previous prime is 20111881. The next prime is 20111933. The reversal of 20111902 is 20911102.

It is a semiprime because it is the product of two primes.

It is a super-4 number, since 4×20111902⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5027974 + ... + 5027977.

It is an arithmetic number, because the mean of its divisors is an integer number (7541964).

Almost surely, 2^20111902 is an apocalyptic number.

20111902 is a deficient number, since it is larger than the sum of its proper divisors (10055954).

20111902 is a wasteful number, since it uses less digits than its factorization.

20111902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10055953.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 20111902 is about 4484.6295276199. The cubic root of 20111902 is about 271.9470683477.

The spelling of 20111902 in words is "twenty million, one hundred eleven thousand, nine hundred two".