20421980245 has 16 divisors (see below), whose sum is σ = 24616069632. Its totient is φ = 16264540800.

The previous prime is 20421980203. The next prime is 20421980251. The reversal of 20421980245 is 54208912402.

It is a de Polignac number, because none of the positive numbers 2^k-20421980245 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2364004 + ... + 2372626.

It is an arithmetic number, because the mean of its divisors is an integer number (1538504352).

Almost surely, 2^20421980245 is an apocalyptic number.

It is an amenable number.

20421980245 is a deficient number, since it is larger than the sum of its proper divisors (4194089387).

20421980245 is a wasteful number, since it uses less digits than its factorization.

20421980245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10692.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 20421980245 in words is "twenty billion, four hundred twenty-one million, nine hundred eighty thousand, two hundred forty-five".