1620820635704 has 8 divisors (see below), whose sum is σ = 3039038691960. Its totient is φ = 810410317848.

The previous prime is 1620820635703. The next prime is 1620820635787. The reversal of 1620820635704 is 4075360280261.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620820635703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101301289724 + ... + 101301289739.

It is an arithmetic number, because the mean of its divisors is an integer number (379879836495).

Almost surely, 2^{1620820635704} is an apocalyptic number.

It is an amenable number.

1620820635704 is a deficient number, since it is larger than the sum of its proper divisors (1418218056256).

1620820635704 is a wasteful number, since it uses less digits than its factorization.

1620820635704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202602579469 (or 202602579465 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 1620820635704 in words is "one trillion, six hundred twenty billion, eight hundred twenty million, six hundred thirty-five thousand, seven hundred four".