20253215553 has 16 divisors (see below), whose sum is σ = 27260312640. Its totient is φ = 13374206784.

The previous prime is 20253215551. The next prime is 20253215581. The reversal of 20253215553 is 35551235202.

It is not a de Polignac number, because 20253215553 - 2¹ = 20253215551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20253215551) 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, 1383450 + ... + 1398012.

It is an arithmetic number, because the mean of its divisors is an integer number (1703769540).

Almost surely, 2^20253215553 is an apocalyptic number.

It is an amenable number.

20253215553 is a deficient number, since it is larger than the sum of its proper divisors (7007097087).

20253215553 is a wasteful number, since it uses less digits than its factorization.

20253215553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18928.

The product of its (nonzero) digits is 45000, while the sum is 33.

The spelling of 20253215553 in words is "twenty billion, two hundred fifty-three million, two hundred fifteen thousand, five hundred fifty-three".