20147555631 has 16 divisors (see below), whose sum is σ = 30704085504. Its totient is φ = 11511745824.

The previous prime is 20147555629. The next prime is 20147555639. The reversal of 20147555631 is 13655574102.

It is not a de Polignac number, because 20147555631 - 2¹ = 20147555629 is a prime.

It is a super-2 number, since 2×20147555631² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20147555631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20147555639) 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, 198481 + ... + 282293.

It is an arithmetic number, because the mean of its divisors is an integer number (1919005344).

Almost surely, 2^20147555631 is an apocalyptic number.

20147555631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20147555631 is a deficient number, since it is larger than the sum of its proper divisors (10556529873).

20147555631 is a wasteful number, since it uses less digits than its factorization.

20147555631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95270.

The product of its (nonzero) digits is 126000, while the sum is 39.

The spelling of 20147555631 in words is "twenty billion, one hundred forty-seven million, five hundred fifty-five thousand, six hundred thirty-one".