20420040422 has 4 divisors (see below), whose sum is σ = 30630060636. Its totient is φ = 10210020210.

The previous prime is 20420040409. The next prime is 20420040427. The reversal of 20420040422 is 22404002402.

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

It is a super-2 number, since 2×20420040422² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20420040394 and 20420040403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420040427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105010104 + ... + 5105010107.

It is an arithmetic number, because the mean of its divisors is an integer number (7657515159).

Almost surely, 2^20420040422 is an apocalyptic number.

20420040422 is a deficient number, since it is larger than the sum of its proper divisors (10210020214).

20420040422 is a wasteful number, since it uses less digits than its factorization.

20420040422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10210020213.

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 20420040422 its reverse (22404002402), we get a palindrome (42824042824).

The spelling of 20420040422 in words is "twenty billion, four hundred twenty million, forty thousand, four hundred twenty-two".