19720695 has 16 divisors (see below), whose sum is σ = 31610880. Its totient is φ = 10498464.

The previous prime is 19720669. The next prime is 19720699. The reversal of 19720695 is 59602791.

It is a de Polignac number, because none of the positive numbers 2^k-19720695 is a prime.

It is a super-2 number, since 2×19720695² = 777811622566050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19720699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11802 + ... + 13368.

It is an arithmetic number, because the mean of its divisors is an integer number (1975680).

Almost surely, 2^19720695 is an apocalyptic number.

19720695 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19720695 is a deficient number, since it is larger than the sum of its proper divisors (11890185).

19720695 is a wasteful number, since it uses less digits than its factorization.

19720695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2414.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 19720695 is about 4440.7989146098. The cubic root of 19720695 is about 270.1722494846.

The spelling of 19720695 in words is "nineteen million, seven hundred twenty thousand, six hundred ninety-five".