20951955 has 24 divisors (see below), whose sum is σ = 36430992. Its totient is φ = 11139264.

The previous prime is 20951947. The next prime is 20951971. The reversal of 20951955 is 55915902.

20951955 = T₃₄ + T₃₅ + ... + T₅₀₀.

It is not a de Polignac number, because 20951955 - 2³ = 20951947 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20517 + ... + 21513.

It is an arithmetic number, because the mean of its divisors is an integer number (1517958).

Almost surely, 2^20951955 is an apocalyptic number.

20951955 is a deficient number, since it is larger than the sum of its proper divisors (15479037).

20951955 is a wasteful number, since it uses less digits than its factorization.

20951955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475 (or 1472 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 36.

The square root of 20951955 is about 4577.3305539364. The cubic root of 20951955 is about 275.6818561654.

The spelling of 20951955 in words is "twenty million, nine hundred fifty-one thousand, nine hundred fifty-five".