20900003437 has 4 divisors (see below), whose sum is σ = 21033124636. Its totient is φ = 20766882240.

The previous prime is 20900003419. The next prime is 20900003471. The reversal of 20900003437 is 73430000902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3810716361 + 17089287076 = 61731^2 + 130726^2 .

It is a cyclic number.

It is not a de Polignac number, because 20900003437 - 2¹¹ = 20900001389 is a prime.

It is a super-2 number, since 2×20900003437² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20900003497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66560364 + ... + 66560677.

It is an arithmetic number, because the mean of its divisors is an integer number (5258281159).

Almost surely, 2^20900003437 is an apocalyptic number.

It is an amenable number.

20900003437 is a deficient number, since it is larger than the sum of its proper divisors (133121199).

20900003437 is a wasteful number, since it uses less digits than its factorization.

20900003437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133121198.

The product of its (nonzero) digits is 4536, while the sum is 28.

The spelling of 20900003437 in words is "twenty billion, nine hundred million, three thousand, four hundred thirty-seven".