20261205351 has 32 divisors (see below), whose sum is σ = 31617696000. Its totient is φ = 12787935264.

The previous prime is 20261205347. The next prime is 20261205383. The reversal of 20261205351 is 15350216202.

It is a happy number.

20261205351 is a `hidden beast` number, since 2 + 0 + 2 + 6 + 120 + 535 + 1 = 666.

It is not a de Polignac number, because 20261205351 - 2² = 20261205347 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20261285351) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 797521 + ... + 822533.

It is an arithmetic number, because the mean of its divisors is an integer number (988053000).

Almost surely, 2^20261205351 is an apocalyptic number.

20261205351 is a deficient number, since it is larger than the sum of its proper divisors (11356490649).

20261205351 is a wasteful number, since it uses less digits than its factorization.

20261205351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26620 (or 26614 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 20261205351 in words is "twenty billion, two hundred sixty-one million, two hundred five thousand, three hundred fifty-one".