20916877542 has 32 divisors (see below), whose sum is σ = 45768392064. Its totient is φ = 6320174400.

The previous prime is 20916877523. The next prime is 20916877573. The reversal of 20916877542 is 24577861902.

It is a happy number.

It is a super-2 number, since 2×20916877542² (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, 433759 + ... + 479562.

It is an arithmetic number, because the mean of its divisors is an integer number (1430262252).

Almost surely, 2^20916877542 is an apocalyptic number.

20916877542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20916877542 is an abundant number, since it is smaller than the sum of its proper divisors (24851514522).

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

20916877542 is a wasteful number, since it uses less digits than its factorization.

20916877542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913684.

The product of its (nonzero) digits is 1693440, while the sum is 51.

The spelling of 20916877542 in words is "twenty billion, nine hundred sixteen million, eight hundred seventy-seven thousand, five hundred forty-two".