20400122 has 8 divisors (see below), whose sum is σ = 30823956. Its totient is φ = 10125472.

The previous prime is 20400101. The next prime is 20400151. The reversal of 20400122 is 22100402.

It can be written as a sum of positive squares in 2 ways, for example, as 20151121 + 249001 = 4489^2 + 499^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20400122² = 832329955229768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36953 + ... + 37500.

Almost surely, 2^20400122 is an apocalyptic number.

20400122 is a deficient number, since it is larger than the sum of its proper divisors (10423834).

20400122 is a wasteful number, since it uses less digits than its factorization.

20400122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74592.

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

The square root of 20400122 is about 4516.6494218613. The cubic root of 20400122 is about 273.2399863014.

Adding to 20400122 its reverse (22100402), we get a palindrome (42500524).

The spelling of 20400122 in words is "twenty million, four hundred thousand, one hundred twenty-two".