20862648247 has 16 divisors (see below), whose sum is σ = 24460434432. Its totient is φ = 17424695520.

The previous prime is 20862648229. The next prime is 20862648253. The reversal of 20862648247 is 74284626802.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20862648247 - 2¹⁹ = 20862123959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20862648247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20862618247) 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, 182623 + ... + 274000.

It is an arithmetic number, because the mean of its divisors is an integer number (1528777152).

Almost surely, 2^20862648247 is an apocalyptic number.

20862648247 is a deficient number, since it is larger than the sum of its proper divisors (3597786185).

20862648247 is a wasteful number, since it uses less digits than its factorization.

20862648247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456798.

The product of its (nonzero) digits is 2064384, while the sum is 49.

The spelling of 20862648247 in words is "twenty billion, eight hundred sixty-two million, six hundred forty-eight thousand, two hundred forty-seven".