20657810019 has 32 divisors (see below), whose sum is σ = 35833319424. Its totient is φ = 10264747680.

The previous prime is 20657809897. The next prime is 20657810081. The reversal of 20657810019 is 91001875602.

It is not a de Polignac number, because 20657810019 - 2⁷ = 20657809891 is a prime.

It is a super-2 number, since 2×20657810019² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20657810119) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1938769 + ... + 1949394.

It is an arithmetic number, because the mean of its divisors is an integer number (1119791232).

Almost surely, 2^20657810019 is an apocalyptic number.

20657810019 is a deficient number, since it is larger than the sum of its proper divisors (15175509405).

20657810019 is a wasteful number, since it uses less digits than its factorization.

20657810019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888207.

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 20657810019 in words is "twenty billion, six hundred fifty-seven million, eight hundred ten thousand, nineteen".