20949501 has 8 divisors (see below), whose sum is σ = 27953824. Its totient is φ = 13955760.

The previous prime is 20949499. The next prime is 20949529. The reversal of 20949501 is 10594902.

It is a happy number.

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

It is not a de Polignac number, because 20949501 - 2¹ = 20949499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20949541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6306 + ... + 9036.

It is an arithmetic number, because the mean of its divisors is an integer number (3494228).

Almost surely, 2^20949501 is an apocalyptic number.

It is an amenable number.

20949501 is a deficient number, since it is larger than the sum of its proper divisors (7004323).

20949501 is a wasteful number, since it uses less digits than its factorization.

20949501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5291.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 20949501 is about 4577.0624859182. The cubic root of 20949501 is about 275.6710926561.

The spelling of 20949501 in words is "twenty million, nine hundred forty-nine thousand, five hundred one".