20920670672 has 80 divisors (see below), whose sum is σ = 44983168512. Its totient is φ = 9345663360.

The previous prime is 20920670591. The next prime is 20920670753. The reversal of 20920670672 is 27607602902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20920670591) and next prime (20920670753).

It is a super-2 number, since 2×20920670672² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5740883 + ... + 5744525.

Almost surely, 2^20920670672 is an apocalyptic number.

20920670672 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20920670672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22491584256).

20920670672 is an abundant number, since it is smaller than the sum of its proper divisors (24062497840).

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

20920670672 is a wasteful number, since it uses less digits than its factorization.

20920670672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4216 (or 4210 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 41.

The spelling of 20920670672 in words is "twenty billion, nine hundred twenty million, six hundred seventy thousand, six hundred seventy-two".