20802257671 has 8 divisors (see below), whose sum is σ = 22420856304. Its totient is φ = 19186291200.

The previous prime is 20802257659. The next prime is 20802257677. The reversal of 20802257671 is 17675220802.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20802257671 - 2¹⁷ = 20802126599 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 (20802257677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 641605 + ... + 673246.

It is an arithmetic number, because the mean of its divisors is an integer number (2802607038).

Almost surely, 2^20802257671 is an apocalyptic number.

20802257671 is a deficient number, since it is larger than the sum of its proper divisors (1618598633).

20802257671 is a wasteful number, since it uses less digits than its factorization.

20802257671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316081.

The product of its (nonzero) digits is 94080, while the sum is 40.

The spelling of 20802257671 in words is "twenty billion, eight hundred two million, two hundred fifty-seven thousand, six hundred seventy-one".