20420404244 has 6 divisors (see below), whose sum is σ = 35735707434. Its totient is φ = 10210202120.

The previous prime is 20420404241. The next prime is 20420404247. The reversal of 20420404244 is 44240402402.

It is an interprime number because it is at equal distance from previous prime (20420404241) and next prime (20420404247).

It can be written as a sum of positive squares in only one way, i.e., 18098320900 + 2322083344 = 134530^2 + 48188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420404241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2552550527 + ... + 2552550534.

It is an arithmetic number, because the mean of its divisors is an integer number (5955951239).

Almost surely, 2^20420404244 is an apocalyptic number.

It is an amenable number.

20420404244 is a deficient number, since it is larger than the sum of its proper divisors (15315303190).

20420404244 is a wasteful number, since it uses less digits than its factorization.

20420404244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105101065 (or 5105101063 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 26.

Adding to 20420404244 its reverse (44240402402), we get a palindrome (64660806646).

The spelling of 20420404244 in words is "twenty billion, four hundred twenty million, four hundred four thousand, two hundred forty-four".