20021632642 has 16 divisors (see below), whose sum is σ = 32764845312. Its totient is φ = 9100138320.

The previous prime is 20021632633. The next prime is 20021632643. The reversal of 20021632642 is 24623612002.

It is a self number, because there is not a number n which added to its sum of digits gives 20021632642.

It is not an unprimeable number, because it can be changed into a prime (20021632643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 622828 + ... + 654184.

It is an arithmetic number, because the mean of its divisors is an integer number (2047802832).

Almost surely, 2^20021632642 is an apocalyptic number.

20021632642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20021632642 is a deficient number, since it is larger than the sum of its proper divisors (12743212670).

20021632642 is a wasteful number, since it uses less digits than its factorization.

20021632642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60393.

The product of its (nonzero) digits is 6912, while the sum is 28.

The spelling of 20021632642 in words is "twenty billion, twenty-one million, six hundred thirty-two thousand, six hundred forty-two".