20953520890 has 16 divisors (see below), whose sum is σ = 37850564520. Its totient is φ = 8351580160.

The previous prime is 20953520879. The next prime is 20953520947. The reversal of 20953520890 is 9802535902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13216031521 + 7737489369 = 114961^2 + 87963^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3725575 + ... + 3731194.

Almost surely, 2^20953520890 is an apocalyptic number.

20953520890 is a deficient number, since it is larger than the sum of its proper divisors (16897043630).

20953520890 is a wasteful number, since it uses less digits than its factorization.

20953520890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7457057.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 20953520890 in words is "twenty billion, nine hundred fifty-three million, five hundred twenty thousand, eight hundred ninety".