20396240761 has 4 divisors (see below), whose sum is σ = 21965182372. Its totient is φ = 18827299152.

The previous prime is 20396240759. The next prime is 20396240789. The reversal of 20396240761 is 16704269302.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3760142400 + 16636098361 = 61320^2 + 128981^2 .

It is a cyclic number.

It is not a de Polignac number, because 20396240761 - 2¹ = 20396240759 is a prime.

It is a super-3 number, since 3×20396240761³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20396240261) 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, 784470786 + ... + 784470811.

It is an arithmetic number, because the mean of its divisors is an integer number (5491295593).

Almost surely, 2^20396240761 is an apocalyptic number.

It is an amenable number.

20396240761 is a deficient number, since it is larger than the sum of its proper divisors (1568941611).

20396240761 is a wasteful number, since it uses less digits than its factorization.

20396240761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568941610.

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 20396240761 in words is "twenty billion, three hundred ninety-six million, two hundred forty thousand, seven hundred sixty-one".