20734605720 has 64 divisors (see below), whose sum is σ = 69115356000. Its totient is φ = 5529227904.

The previous prime is 20734605707. The next prime is 20734605737. The reversal of 20734605720 is 2750643702.

It is a happy number.

20734605720 is a `hidden beast` number, since 20 + 7 + 3 + 4 + 60 + 572 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9598275 + ... + 9600434.

Almost surely, 2^20734605720 is an apocalyptic number.

20734605720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20734605720 is an abundant number, since it is smaller than the sum of its proper divisors (48380750280).

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

20734605720 is a wasteful number, since it uses less digits than its factorization.

20734605720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19198729 (or 19198719 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

The spelling of 20734605720 in words is "twenty billion, seven hundred thirty-four million, six hundred five thousand, seven hundred twenty".