20687152690 has 16 divisors (see below), whose sum is σ = 39196710720. Its totient is φ = 7839342000.

The previous prime is 20687152663. The next prime is 20687152693. The reversal of 20687152690 is 9625178602.

It is a super-2 number, since 2×20687152690² (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 20687152690.

It is not an unprimeable number, because it can be changed into a prime (20687152693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54439686 + ... + 54440065.

It is an arithmetic number, because the mean of its divisors is an integer number (2449794420).

Almost surely, 2^20687152690 is an apocalyptic number.

20687152690 is a deficient number, since it is larger than the sum of its proper divisors (18509558030).

20687152690 is a wasteful number, since it uses less digits than its factorization.

20687152690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108879777.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 20687152690 in words is "twenty billion, six hundred eighty-seven million, one hundred fifty-two thousand, six hundred ninety".