20021240767 has 16 divisors (see below), whose sum is σ = 22899052800. Its totient is φ = 17327217600.

The previous prime is 20021240699. The next prime is 20021240779. The reversal of 20021240767 is 76704212002.

It is a de Polignac number, because none of the positive numbers 2^k-20021240767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021241767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134142 + ... + 240907.

It is an arithmetic number, because the mean of its divisors is an integer number (1431190800).

Almost surely, 2^20021240767 is an apocalyptic number.

20021240767 is a deficient number, since it is larger than the sum of its proper divisors (2877812033).

20021240767 is a wasteful number, since it uses less digits than its factorization.

20021240767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375294.

The product of its (nonzero) digits is 9408, while the sum is 31.

Adding to 20021240767 its reverse (76704212002), we get a palindrome (96725452769).

The spelling of 20021240767 in words is "twenty billion, twenty-one million, two hundred forty thousand, seven hundred sixty-seven".