20952155 has 32 divisors (see below), whose sum is σ = 30912000. Its totient is φ = 13589856.

The previous prime is 20952091. The next prime is 20952161. The reversal of 20952155 is 55125902.

It is not a de Polignac number, because 20952155 - 2⁶ = 20952091 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32264 + ... + 32906.

It is an arithmetic number, because the mean of its divisors is an integer number (966000).

Almost surely, 2^20952155 is an apocalyptic number.

20952155 is a deficient number, since it is larger than the sum of its proper divisors (9959845).

20952155 is an equidigital number, since it uses as much as digits as its factorization.

20952155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688 (or 674 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 20952155 is about 4577.3524006788. The cubic root of 20952155 is about 275.6827333500.

The spelling of 20952155 in words is "twenty million, nine hundred fifty-two thousand, one hundred fifty-five".