20573009640 has 128 divisors (see below), whose sum is σ = 71558380800. Its totient is φ = 5247601920.

The previous prime is 20573009603. The next prime is 20573009657. The reversal of 20573009640 is 4690037502.

20573009640 is a `hidden beast` number, since 2 + 0 + 5 + 7 + 3 + 0 + 0 + 9 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20573009595 and 20573009604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 389271 + ... + 438950.

It is an arithmetic number, because the mean of its divisors is an integer number (559049850).

Almost surely, 2^20573009640 is an apocalyptic number.

20573009640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20573009640 is an abundant number, since it is smaller than the sum of its proper divisors (50985371160).

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

20573009640 is a wasteful number, since it uses less digits than its factorization.

20573009640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828264 (or 828254 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The spelling of 20573009640 in words is "twenty billion, five hundred seventy-three million, nine thousand, six hundred forty".