20155953 has 16 divisors (see below), whose sum is σ = 27656640. Its totient is φ = 13051584.

The previous prime is 20155951. The next prime is 20155987. The reversal of 20155953 is 35955102.

It is not a de Polignac number, because 20155953 - 2¹ = 20155951 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20155953.

It is not an unprimeable number, because it can be changed into a prime (20155951) 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, 16750 + ... + 17912.

It is an arithmetic number, because the mean of its divisors is an integer number (1728540).

Almost surely, 2^20155953 is an apocalyptic number.

It is an amenable number.

20155953 is a deficient number, since it is larger than the sum of its proper divisors (7500687).

20155953 is a wasteful number, since it uses less digits than its factorization.

20155953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328.

The product of its (nonzero) digits is 6750, while the sum is 30.

The square root of 20155953 is about 4489.5381722400. The cubic root of 20155953 is about 272.1454716728.

The spelling of 20155953 in words is "twenty million, one hundred fifty-five thousand, nine hundred fifty-three".