20200686740 has 24 divisors (see below), whose sum is σ = 45684630600. Its totient is φ = 7458715008.

The previous prime is 20200686731. The next prime is 20200686761. The reversal of 20200686740 is 4768600202.

It can be written as a sum of positive squares in 4 ways, for example, as 1474406404 + 18726280336 = 38398^2 + 136844^2 .

It is a super-2 number, since 2×20200686740² (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 20200686740.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38847215 + ... + 38847734.

It is an arithmetic number, because the mean of its divisors is an integer number (1903526275).

Almost surely, 2^20200686740 is an apocalyptic number.

20200686740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20200686740 is an abundant number, since it is smaller than the sum of its proper divisors (25483943860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20200686740 is a wasteful number, since it uses less digits than its factorization.

20200686740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77694971 (or 77694969 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The spelling of 20200686740 in words is "twenty billion, two hundred million, six hundred eighty-six thousand, seven hundred forty".