20402111 has 4 divisors (see below), whose sum is σ = 20448000. Its totient is φ = 20356224.

The previous prime is 20402099. The next prime is 20402119. The reversal of 20402111 is 11120402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20402111 is a prime.

It is a super-2 number, since 2×20402111² = 832492266512642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20402092 and 20402101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22271 + ... + 23168.

It is an arithmetic number, because the mean of its divisors is an integer number (5112000).

Almost surely, 2^20402111 is an apocalyptic number.

20402111 is a deficient number, since it is larger than the sum of its proper divisors (45889).

20402111 is an equidigital number, since it uses as much as digits as its factorization.

20402111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45888.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 20402111 is about 4516.8696018371. The cubic root of 20402111 is about 273.2488662592.

Adding to 20402111 its reverse (11120402), we get a palindrome (31522513).

It can be divided in two parts, 20402 and 111, that multiplied together give a palindrome (2264622).

The spelling of 20402111 in words is "twenty million, four hundred two thousand, one hundred eleven".