20297877646 has 16 divisors (see below), whose sum is σ = 30600108000. Its totient is φ = 10097936928.

The previous prime is 20297877641. The next prime is 20297877653. The reversal of 20297877646 is 64677879202.

20297877646 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20297877641) 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, 412780 + ... + 459328.

It is an arithmetic number, because the mean of its divisors is an integer number (1912506750).

Almost surely, 2^20297877646 is an apocalyptic number.

20297877646 is a deficient number, since it is larger than the sum of its proper divisors (10302230354).

20297877646 is a wasteful number, since it uses less digits than its factorization.

20297877646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47643.

The product of its (nonzero) digits is 14224896, while the sum is 58.

The spelling of 20297877646 in words is "twenty billion, two hundred ninety-seven million, eight hundred seventy-seven thousand, six hundred forty-six".