20434256572 has 24 divisors (see below), whose sum is σ = 38014759440. Its totient is φ = 9583545600.

The previous prime is 20434256503. The next prime is 20434256587. The reversal of 20434256572 is 27565243402.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1323373 + ... + 1338724.

It is an arithmetic number, because the mean of its divisors is an integer number (1583948310).

Almost surely, 2^20434256572 is an apocalyptic number.

It is an amenable number.

20434256572 is a deficient number, since it is larger than the sum of its proper divisors (17580502868).

20434256572 is a wasteful number, since it uses less digits than its factorization.

20434256572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662221 (or 2662219 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 40.

Adding to 20434256572 its reverse (27565243402), we get a palindrome (47999499974).

The spelling of 20434256572 in words is "twenty billion, four hundred thirty-four million, two hundred fifty-six thousand, five hundred seventy-two".