20248279749 has 8 divisors (see below), whose sum is σ = 29997451520. Its totient is φ = 13498853148.

The previous prime is 20248279739. The next prime is 20248279759. The reversal of 20248279749 is 94797284202.

It is a happy number.

20248279749 is a `hidden beast` number, since 20 + 2 + 482 + 79 + 74 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (20248279739) and next prime (20248279759).

It is not a de Polignac number, because 20248279749 - 2¹⁵ = 20248246981 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20248279695 and 20248279704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20248279739) 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, 374968117 + ... + 374968170.

It is an arithmetic number, because the mean of its divisors is an integer number (3749681440).

Almost surely, 2^20248279749 is an apocalyptic number.

It is an amenable number.

20248279749 is a deficient number, since it is larger than the sum of its proper divisors (9749171771).

20248279749 is an equidigital number, since it uses as much as digits as its factorization.

20248279749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749936296 (or 749936290 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The spelling of 20248279749 in words is "twenty billion, two hundred forty-eight million, two hundred seventy-nine thousand, seven hundred forty-nine".