20406031242 has 16 divisors (see below), whose sum is σ = 40834471680. Its totient is φ = 6798275552.

The previous prime is 20406031241. The next prime is 20406031249. The reversal of 20406031242 is 24213060402.

It is a super-2 number, since 2×20406031242² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20406031241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 921867 + ... + 943742.

It is an arithmetic number, because the mean of its divisors is an integer number (2552154480).

Almost surely, 2^20406031242 is an apocalyptic number.

20406031242 is an abundant number, since it is smaller than the sum of its proper divisors (20428440438).

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

20406031242 is a wasteful number, since it uses less digits than its factorization.

20406031242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867437.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 20406031242 its reverse (24213060402), we get a palindrome (44619091644).

The spelling of 20406031242 in words is "twenty billion, four hundred six million, thirty-one thousand, two hundred forty-two".