20694793017409 has 9 divisors (see below), whose sum is σ = 24073571777697. Its totient is φ = 17738366720004.

The previous prime is 20694793017407. The next prime is 20694793017559. The reversal of 20694793017409 is 90471039749602.

The square root of 20694793017409 is 4549153.

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

It is not a de Polignac number, because 20694793017409 - 2¹ = 20694793017407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20694793017407) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 31519132 + ... + 32169010.

It is an arithmetic number, because the mean of its divisors is an integer number (2674841308633).

Almost surely, 2^{20694793017409} is an apocalyptic number.

20694793017409 is the 4549153-rd square number.

20694793017409 is the 2274577-th centered octagonal number.

It is an amenable number.

20694793017409 is a deficient number, since it is larger than the sum of its proper divisors (3378778760288).

20694793017409 is an frugal number, since it uses more digits than its factorization.

20694793017409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299772 (or 649886 counting only the distinct ones).

The product of its (nonzero) digits is 20575296, while the sum is 61.

The spelling of 20694793017409 in words is "twenty trillion, six hundred ninety-four billion, seven hundred ninety-three million, seventeen thousand, four hundred nine".