20216810731 has 12 divisors (see below), whose sum is σ = 22262630760. Its totient is φ = 18345362880.

The previous prime is 20216810729. The next prime is 20216810741. The reversal of 20216810731 is 13701861202.

It is not a de Polignac number, because 20216810731 - 2¹ = 20216810729 is a prime.

It is a super-2 number, since 2×20216810731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20216810693 and 20216810702.

It is not an unprimeable number, because it can be changed into a prime (20216810741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1003810 + ... + 1023751.

It is an arithmetic number, because the mean of its divisors is an integer number (1855219230).

Almost surely, 2^20216810731 is an apocalyptic number.

20216810731 is a deficient number, since it is larger than the sum of its proper divisors (2045820029).

20216810731 is a wasteful number, since it uses less digits than its factorization.

20216810731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027646 (or 2027633 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The spelling of 20216810731 in words is "twenty billion, two hundred sixteen million, eight hundred ten thousand, seven hundred thirty-one".