20719660 has 24 divisors (see below), whose sum is σ = 46858896. Its totient is φ = 7650240.

The previous prime is 20719639. The next prime is 20719693. The reversal of 20719660 is 6691702.

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, 39586 + ... + 40105.

It is an arithmetic number, because the mean of its divisors is an integer number (1952454).

Almost surely, 2^20719660 is an apocalyptic number.

20719660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20719660 is an abundant number, since it is smaller than the sum of its proper divisors (26139236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20719660 is a wasteful number, since it uses less digits than its factorization.

20719660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79713 (or 79711 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 20719660 is about 4551.8853236873. The cubic root of 20719660 is about 274.6592363225.

The spelling of 20719660 in words is "twenty million, seven hundred nineteen thousand, six hundred sixty".