20693949 has 8 divisors (see below), whose sum is σ = 27683040. Its totient is φ = 13750416.

The previous prime is 20693941. The next prime is 20693993. The reversal of 20693949 is 94939602.

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

It is not a de Polignac number, because 20693949 - 2³ = 20693941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20693949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20693941) 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, 10314 + ... + 12155.

It is an arithmetic number, because the mean of its divisors is an integer number (3460380).

Almost surely, 2^20693949 is an apocalyptic number.

It is an amenable number.

20693949 is a deficient number, since it is larger than the sum of its proper divisors (6989091).

20693949 is a wasteful number, since it uses less digits than its factorization.

20693949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22779.

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 20693949 is about 4549.0602326195. The cubic root of 20693949 is about 274.5455811979.

The spelling of 20693949 in words is "twenty million, six hundred ninety-three thousand, nine hundred forty-nine".