20207643730 has 16 divisors (see below), whose sum is σ = 36617880600. Its totient is φ = 8028808192.

The previous prime is 20207643727. The next prime is 20207643733. The reversal of 20207643730 is 3734670202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20207643727) and next prime (20207643733).

It can be written as a sum of positive squares in 4 ways, for example, as 14556663801 + 5650979929 = 120651^2 + 75173^2 .

It is not an unprimeable number, because it can be changed into a prime (20207643733) 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, 6779599 + ... + 6782578.

Almost surely, 2^20207643730 is an apocalyptic number.

20207643730 is a deficient number, since it is larger than the sum of its proper divisors (16410236870).

20207643730 is a wasteful number, since it uses less digits than its factorization.

20207643730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13562333.

The product of its (nonzero) digits is 42336, while the sum is 34.

The spelling of 20207643730 in words is "twenty billion, two hundred seven million, six hundred forty-three thousand, seven hundred thirty".