20280624242 has 4 divisors (see below), whose sum is σ = 30420936366. Its totient is φ = 10140312120.

The previous prime is 20280624229. The next prime is 20280624251. The reversal of 20280624242 is 24242608202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24242608202 = 2 ⋅12121304101.

It can be written as a sum of positive squares in only one way, i.e., 14832560521 + 5448063721 = 121789^2 + 73811^2 .

It is a super-2 number, since 2×20280624242² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20280624199 and 20280624208.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5070156059 + ... + 5070156062.

Almost surely, 2^20280624242 is an apocalyptic number.

20280624242 is a deficient number, since it is larger than the sum of its proper divisors (10140312124).

20280624242 is a wasteful number, since it uses less digits than its factorization.

20280624242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10140312123.

The product of its (nonzero) digits is 24576, while the sum is 32.

The spelling of 20280624242 in words is "twenty billion, two hundred eighty million, six hundred twenty-four thousand, two hundred forty-two".