20400231022 has 4 divisors (see below), whose sum is σ = 30600346536. Its totient is φ = 10200115510.

The previous prime is 20400230959. The next prime is 20400231023. The reversal of 20400231022 is 22013200402.

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 = 20400230987 and 20400231005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400231023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100057754 + ... + 5100057757.

It is an arithmetic number, because the mean of its divisors is an integer number (7650086634).

Almost surely, 2^20400231022 is an apocalyptic number.

20400231022 is a deficient number, since it is larger than the sum of its proper divisors (10200115514).

20400231022 is a wasteful number, since it uses less digits than its factorization.

20400231022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10200115513.

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20400231022 its reverse (22013200402), we get a palindrome (42413431424).

The spelling of 20400231022 in words is "twenty billion, four hundred million, two hundred thirty-one thousand, twenty-two".