20400022 has 4 divisors (see below), whose sum is σ = 30600036. Its totient is φ = 10200010.

The previous prime is 20400019. The next prime is 20400031. The reversal of 20400022 is 22000402.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 20399981 and 20400008.

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, 5100004 + ... + 5100007.

It is an arithmetic number, because the mean of its divisors is an integer number (7650009).

Almost surely, 2^20400022 is an apocalyptic number.

20400022 is a deficient number, since it is larger than the sum of its proper divisors (10200014).

20400022 is a wasteful number, since it uses less digits than its factorization.

20400022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10200013.

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 20400022 is about 4516.6383516948. The cubic root of 20400022 is about 273.2395398327.

Adding to 20400022 its reverse (22000402), we get a palindrome (42400424).

The spelling of 20400022 in words is "twenty million, four hundred thousand, twenty-two".