20751520894 has 32 divisors (see below), whose sum is σ = 34754065920. Its totient is φ = 9226973952.

The previous prime is 20751520861. The next prime is 20751520913. The reversal of 20751520894 is 49802515702.

It is a self number, because there is not a number n which added to its sum of digits gives 20751520894.

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, 314467 + ... + 374689.

It is an arithmetic number, because the mean of its divisors is an integer number (1086064560).

Almost surely, 2^20751520894 is an apocalyptic number.

20751520894 is a deficient number, since it is larger than the sum of its proper divisors (14002545026).

20751520894 is a wasteful number, since it uses less digits than its factorization.

20751520894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60724.

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 20751520894 in words is "twenty billion, seven hundred fifty-one million, five hundred twenty thousand, eight hundred ninety-four".