20402120 has 32 divisors (see below), whose sum is σ = 46078200. Its totient is φ = 8130048.

The previous prime is 20402119. The next prime is 20402131. The reversal of 20402120 is 2120402.

It can be written as a sum of positive squares in 4 ways, for example, as 17023876 + 3378244 = 4126^2 + 1838^2 .

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, 11876 + ... + 13484.

Almost surely, 2^20402120 is an apocalyptic number.

20402120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20402120 is an abundant number, since it is smaller than the sum of its proper divisors (25676080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20402120 is a wasteful number, since it uses less digits than its factorization.

20402120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937 (or 1933 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 20402120 is about 4516.8705981022. The cubic root of 20402120 is about 273.2489064387.

Adding to 20402120 its reverse (2120402), we get a palindrome (22522522).

The spelling of 20402120 in words is "twenty million, four hundred two thousand, one hundred twenty".