20784810137 has 16 divisors (see below), whose sum is σ = 26063976960. Its totient is φ = 16134835392.

The previous prime is 20784810107. The next prime is 20784810161. The reversal of 20784810137 is 73101848702.

It is not a de Polignac number, because 20784810137 - 2¹⁰ = 20784809113 is a prime.

It is a super-2 number, since 2×20784810137² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20784810094 and 20784810103.

It is not an unprimeable number, because it can be changed into a prime (20784810107) 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, 2149937 + ... + 2159582.

It is an arithmetic number, because the mean of its divisors is an integer number (1628998560).

Almost surely, 2^20784810137 is an apocalyptic number.

It is an amenable number.

20784810137 is a deficient number, since it is larger than the sum of its proper divisors (5279166823).

20784810137 is a wasteful number, since it uses less digits than its factorization.

20784810137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4309592.

The product of its (nonzero) digits is 75264, while the sum is 41.

The spelling of 20784810137 in words is "twenty billion, seven hundred eighty-four million, eight hundred ten thousand, one hundred thirty-seven".