20734737261 has 16 divisors (see below), whose sum is σ = 31647018624. Its totient is φ = 11829210624.

The previous prime is 20734737253. The next prime is 20734737277. The reversal of 20734737261 is 16273743702.

It is a happy number.

It is not a de Polignac number, because 20734737261 - 2³ = 20734737253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20734737161) 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, 787180 + ... + 813093.

It is an arithmetic number, because the mean of its divisors is an integer number (1977938664).

Almost surely, 2^20734737261 is an apocalyptic number.

20734737261 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20734737261 is a deficient number, since it is larger than the sum of its proper divisors (10912281363).

20734737261 is a wasteful number, since it uses less digits than its factorization.

20734737261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600900.

The product of its (nonzero) digits is 296352, while the sum is 42.

The spelling of 20734737261 in words is "twenty billion, seven hundred thirty-four million, seven hundred thirty-seven thousand, two hundred sixty-one".