20953705 has 8 divisors (see below), whose sum is σ = 25272000. Its totient is φ = 16677936.

The previous prime is 20953693. The next prime is 20953717. The reversal of 20953705 is 50735902.

It is a happy number.

20953705 is nontrivially palindromic in base 7.

It is an interprime number because it is at equal distance from previous prime (20953693) and next prime (20953717).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20953705 - 2⁷ = 20953577 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9535 + ... + 11524.

It is an arithmetic number, because the mean of its divisors is an integer number (3159000).

Almost surely, 2^20953705 is an apocalyptic number.

It is an amenable number.

20953705 is a deficient number, since it is larger than the sum of its proper divisors (4318295).

20953705 is a wasteful number, since it uses less digits than its factorization.

20953705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21263.

The product of its (nonzero) digits is 9450, while the sum is 31.

The square root of 20953705 is about 4577.5217093969. The cubic root of 20953705 is about 275.6895313413.

The spelling of 20953705 in words is "twenty million, nine hundred fifty-three thousand, seven hundred five".