20321420747 has 16 divisors (see below), whose sum is σ = 21588716160. Its totient is φ = 19062237312.

The previous prime is 20321420723. The next prime is 20321420767. The reversal of 20321420747 is 74702412302.

It is a cyclic number.

It is not a de Polignac number, because 20321420747 - 2¹² = 20321416651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20321420767) 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, 9058808 + ... + 9061050.

It is an arithmetic number, because the mean of its divisors is an integer number (1349294760).

Almost surely, 2^20321420747 is an apocalyptic number.

20321420747 is a deficient number, since it is larger than the sum of its proper divisors (1267295413).

20321420747 is a wasteful number, since it uses less digits than its factorization.

20321420747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3802.

The product of its (nonzero) digits is 18816, while the sum is 32.

The spelling of 20321420747 in words is "twenty billion, three hundred twenty-one million, four hundred twenty thousand, seven hundred forty-seven".