20424220424 has 8 divisors (see below), whose sum is σ = 38295413310. Its totient is φ = 10212110208.

The previous prime is 20424220387. The next prime is 20424220459. The reversal of 20424220424 is 42402242402.

It can be written as a sum of positive squares in only one way, i.e., 19315996324 + 1108224100 = 138982^2 + 33290^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20424220393 and 20424220402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1276513769 + ... + 1276513784.

Almost surely, 2^20424220424 is an apocalyptic number.

It is an amenable number.

20424220424 is a deficient number, since it is larger than the sum of its proper divisors (17871192886).

20424220424 is a wasteful number, since it uses less digits than its factorization.

20424220424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2553027559 (or 2553027555 counting only the distinct ones).

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

Adding to 20424220424 its reverse (42402242402), we get a palindrome (62826462826).

The spelling of 20424220424 in words is "twenty billion, four hundred twenty-four million, two hundred twenty thousand, four hundred twenty-four".