20215802265 has 16 divisors (see below), whose sum is σ = 32631527808. Its totient is φ = 10686346496.

The previous prime is 20215802261. The next prime is 20215802273. The reversal of 20215802265 is 56220851202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20215802265 - 2² = 20215802261 is a prime.

It is a super-2 number, since 2×20215802265² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20215802261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5961669 + ... + 5965058.

It is an arithmetic number, because the mean of its divisors is an integer number (2039470488).

Almost surely, 2^20215802265 is an apocalyptic number.

It is an amenable number.

20215802265 is a deficient number, since it is larger than the sum of its proper divisors (12415725543).

20215802265 is a wasteful number, since it uses less digits than its factorization.

20215802265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11926848.

The product of its (nonzero) digits is 19200, while the sum is 33.

The spelling of 20215802265 in words is "twenty billion, two hundred fifteen million, eight hundred two thousand, two hundred sixty-five".