20699760990601 has 135 divisors (see below), whose sum is σ = 27823193727693. Its totient is φ = 15386354066160.

The previous prime is 20699760990589. The next prime is 20699760990617. The reversal of 20699760990601 is 10609906799602.

The square root of 20699760990601 is 4549699.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 20699760990601 - 2¹⁵ = 20699760957833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20699760990661) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 56402618320 + ... + 56402618686.

Almost surely, 2^{20699760990601} is an apocalyptic number.

20699760990601 is the 4549699-th square number.

20699760990601 is the 2274850-th centered octagonal number.

It is an amenable number.

20699760990601 is a deficient number, since it is larger than the sum of its proper divisors (7123432737092).

20699760990601 is an frugal number, since it uses more digits than its factorization.

20699760990601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 19840464, while the sum is 64.

The spelling of 20699760990601 in words is "twenty trillion, six hundred ninety-nine billion, seven hundred sixty million, nine hundred ninety thousand, six hundred one".