20440402152 has 16 divisors (see below), whose sum is σ = 51101005440. Its totient is φ = 6813467376.

The previous prime is 20440402121. The next prime is 20440402181. The reversal of 20440402152 is 25120404402.

It is a happy number.

It is a super-2 number, since 2×20440402152² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 851683423 = 20440402152 / (2 + 0 + 4 + 4 + 0 + 4 + 0 + 2 + 1 + 5 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 425841688 + ... + 425841735.

It is an arithmetic number, because the mean of its divisors is an integer number (3193812840).

Almost surely, 2^20440402152 is an apocalyptic number.

It is an amenable number.

20440402152 is an abundant number, since it is smaller than the sum of its proper divisors (30660603288).

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

20440402152 is a wasteful number, since it uses less digits than its factorization.

20440402152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851683432 (or 851683428 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

Adding to 20440402152 its reverse (25120404402), we get a palindrome (45560806554).

The spelling of 20440402152 in words is "twenty billion, four hundred forty million, four hundred two thousand, one hundred fifty-two".