20761967501 has 4 divisors (see below), whose sum is σ = 22649419104. Its totient is φ = 18874515900.

The previous prime is 20761967461. The next prime is 20761967507. The reversal of 20761967501 is 10576916702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20761967501 - 2¹⁸ = 20761705357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20761967507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943725785 + ... + 943725806.

It is an arithmetic number, because the mean of its divisors is an integer number (5662354776).

Almost surely, 2^20761967501 is an apocalyptic number.

It is an amenable number.

20761967501 is a deficient number, since it is larger than the sum of its proper divisors (1887451603).

20761967501 is a wasteful number, since it uses less digits than its factorization.

20761967501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887451602.

The product of its (nonzero) digits is 158760, while the sum is 44.

The spelling of 20761967501 in words is "twenty billion, seven hundred sixty-one million, nine hundred sixty-seven thousand, five hundred one".