20621474734 has 16 divisors (see below), whose sum is σ = 36888104448. Its totient is φ = 8453523672.

The previous prime is 20621474693. The next prime is 20621474747. The reversal of 20621474734 is 43747412602.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 32020602 + ... + 32021245.

It is an arithmetic number, because the mean of its divisors is an integer number (2305506528).

Almost surely, 2^20621474734 is an apocalyptic number.

20621474734 is a deficient number, since it is larger than the sum of its proper divisors (16266629714).

20621474734 is a wasteful number, since it uses less digits than its factorization.

20621474734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64041879.

The product of its (nonzero) digits is 225792, while the sum is 40.

The spelling of 20621474734 in words is "twenty billion, six hundred twenty-one million, four hundred seventy-four thousand, seven hundred thirty-four".