20021457603 has 32 divisors (see below), whose sum is σ = 31104124416. Its totient is φ = 11217892608.

The previous prime is 20021457587. The next prime is 20021457641. The reversal of 20021457603 is 30675412002.

It is not a de Polignac number, because 20021457603 - 2⁴ = 20021457587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20021457653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2117775 + ... + 2127207.

It is an arithmetic number, because the mean of its divisors is an integer number (972003888).

Almost surely, 2^20021457603 is an apocalyptic number.

20021457603 is a deficient number, since it is larger than the sum of its proper divisors (11082666813).

20021457603 is a wasteful number, since it uses less digits than its factorization.

20021457603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11403.

The product of its (nonzero) digits is 10080, while the sum is 30.

Adding to 20021457603 its reverse (30675412002), we get a palindrome (50696869605).

The spelling of 20021457603 in words is "twenty billion, twenty-one million, four hundred fifty-seven thousand, six hundred three".