20153723261 has 16 divisors (see below), whose sum is σ = 24427186560. Its totient is φ = 16232140800.

The previous prime is 20153723243. The next prime is 20153723279. The reversal of 20153723261 is 16232735102.

It is an interprime number because it is at equal distance from previous prime (20153723243) and next prime (20153723279).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20153723261 is a prime.

It is a super-2 number, since 2×20153723261² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20153723561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63140 + ... + 210461.

It is an arithmetic number, because the mean of its divisors is an integer number (1526699160).

Almost surely, 2^20153723261 is an apocalyptic number.

It is an amenable number.

20153723261 is a deficient number, since it is larger than the sum of its proper divisors (4273463299).

20153723261 is a wasteful number, since it uses less digits than its factorization.

20153723261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274244.

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 20153723261 in words is "twenty billion, one hundred fifty-three million, seven hundred twenty-three thousand, two hundred sixty-one".