20920536 has 192 divisors, whose sum is σ = 72683520. Its totient is φ = 5287680.

The previous prime is 20920519. The next prime is 20920541. The reversal of 20920536 is 63502902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 203061 + ... + 203163.

It is an arithmetic number, because the mean of its divisors is an integer number (378560).

Almost surely, 2^20920536 is an apocalyptic number.

20920536 is a gapful number since it is divisible by the number (26) 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 20920536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36341760).

20920536 is an abundant number, since it is smaller than the sum of its proper divisors (51762984).

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

20920536 is a wasteful number, since it uses less digits than its factorization.

20920536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20920536 is about 4573.8972441453. The cubic root of 20920536 is about 275.5439854760.

The spelling of 20920536 in words is "twenty million, nine hundred twenty thousand, five hundred thirty-six".