20642611542 has 32 divisors (see below), whose sum is σ = 47455863552. Its totient is φ = 5863795104.

The previous prime is 20642611537. The next prime is 20642611543. The reversal of 20642611542 is 24511624602.

It is a super-2 number, since 2×20642611542² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20642611543) 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, 1413228 + ... + 1427759.

It is an arithmetic number, because the mean of its divisors is an integer number (1482995736).

Almost surely, 2^20642611542 is an apocalyptic number.

20642611542 is an abundant number, since it is smaller than the sum of its proper divisors (26813252010).

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

20642611542 is a wasteful number, since it uses less digits than its factorization.

20642611542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2841172.

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 20642611542 in words is "twenty billion, six hundred forty-two million, six hundred eleven thousand, five hundred forty-two".