20401365215 has 64 divisors (see below), whose sum is σ = 31104248832. Its totient is φ = 12477696000.

The previous prime is 20401365203. The next prime is 20401365227. The reversal of 20401365215 is 51256310402.

It is an interprime number because it is at equal distance from previous prime (20401365203) and next prime (20401365227).

It is not a de Polignac number, because 20401365215 - 2²⁰ = 20400316639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4391684 + ... + 4396326.

It is an arithmetic number, because the mean of its divisors is an integer number (486003888).

Almost surely, 2^20401365215 is an apocalyptic number.

20401365215 is a deficient number, since it is larger than the sum of its proper divisors (10702883617).

20401365215 is a wasteful number, since it uses less digits than its factorization.

20401365215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4880.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 20401365215 its reverse (51256310402), we get a palindrome (71657675617).

The spelling of 20401365215 in words is "twenty billion, four hundred one million, three hundred sixty-five thousand, two hundred fifteen".